LED Growers Unite, Who makes the BEST LED and how long has it lasted ? Cast Your Vote!!!

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Search results | International Society for Horticultural Science

www.ishs.org

Horticultural lighting

Articles, news, products, blogs and videos covering the Industry Guide > General Lighting > Horticultural lighting market.

www.ledsmagazine.com

HLG Scorpion® Diablo Series

HLG Scorpion® Diablo™ commercial lamps are designed for growers who want to maximize crop yields with a grow light that offers both high intensity and high efficiency. This lamp uses 6 advanced design Diablo Quantum Boards® for an even light spread making it perfect for tents, flood tables...

horticulturelightinggroup.com

Specifications​

Power Options	650 Watts, 720 Watts, 750 Watts
Input Voltage Options	120-277VAC or 277-500VAC
AC NEMA Plug Options	5-15, 5-20, 6-15, 6-20, L7-15, L7-20, Pigtails
Dimming	0-10V with standard RJ11 cable
Flowering Footprint	5' x 5' at 15" - 24"
Veg Footprint	6' x 6' at 30” - 36"
Dimensions	38.75" x 36.125" x 3.25"
Product Weight	24.15 lbs
Recommended Mounting Height	15-24 inches above canopy
Certifications	UL 8800, UL 1598, CSA, DLC

These lamps produce over 2090/2200 PPF output to maximize yields.

Certifications

UL 8800, UL 1598, CSA, DLC

OH WELL ENOUGH OF THAT AND COMMERCIAL EXAMPLES FOR NOW
WANNA ADD BRIDGELUX AND WHAT ELSE HAVE YOU ?
Industry-standard 2835 footprint

SMD LED - Wikipedia

en.wikipedia.org

ssl-agriculture-jun2020.pdf

drive.google.com

PAGE 10 FROM SSL LINK INVALUABLE EDU JUNE 2020 HIGHLY RECOMMENDED READING

 

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Figure 4 Effects of spectrum and PPFD on yield and light use efficiency of Cannabis sativa. (A) inflorescence dry weight; (B) inflorescence density; (C) inflorescence light use efficiency; (D) plant height; (E) and plant dry weight and partitioning. Bars indicate means of two blocks (n = 2) each consisting of 9 replicate plants. Main effects are shown when no interaction is found. Error bars represent standard error of means (SEM). Different letters (within lowercase and uppercase) indicate significant differences between treatments (Fisher’s unprotected LSD test, P = 0.10).

The role of red and white light in optimizing growth and accumulation of plant specialized metabolites at two light intensities in medical cannabis (Cannabis sativa L.)
Front. Plant Sci., 17 June 2024
Sec. Crop and Product Physiology
Volume 15 - 2024 | https://doi.org/10.3389/fpls.2024.1393803

Light fixture efficiency​

Unit	Calculation
Daily light integral (DLI)	0.0036 × PPFD (μmol⋅m−2⋅s−1) × duration of exposure
Photosynthetic photon efficacy (PPE)	Photosynthetic photon flux (PPF) μmol/W

Photosynthetically active radiation - Wikipedia

en.wikipedia.org

Photosynthetic efficiency - Wikipedia

en.wikipedia.org

Luminous efficacy - Wikipedia

en.wikipedia.org

Category	Type	Overall luminous efficacy (lm/W)	Overall luminous efficiency[note 4]
Ideal sources	Green light at 555 nm (maximum possible luminous efficacy by definition)	683.002[11][54]	100%
Light-emitting diode	Theoretical limit for a white LED with phosphorescence color mixing	260–300[31]	38.1–43.9%
Ideal sources	Truncated 5800 K black-body[note 7]	251[9]	37%
Light-emitting diode	21.5 W LED retrofit for T8 fluorescent tube (230 V)	172[30]	25%
Gas discharge	1400 W sulfur lamp	100[46]	15%
Gas discharge	Low-pressure sodium lamp	100–200[18][48][49][50]	15–29%
Cathodoluminescence	Electron-stimulated luminescence	30–110[52][53]	15%
Light-emitting diode	LED screw base lamp (120 V)	102[24][25][26]	14.9%
Fluorescent	T8 tube with electronic ballast	80–100[38]	12–15%
Fluorescent	PL-S 11 W U-tube, excluding ballast loss	82[42]	12%
Gas discharge	High-pressure sodium lamp	85–150[18]	12–22%
Light-emitting diode	5–16 W LED screw base lamp (230 V)	75–212[27][28][29]	11–31%
Fluorescent	T5 tube	70–104.2[43][44]	10–15.63%
Fluorescent	70–150 W inductively-coupled electrodeless lighting system	71–84[45]	10–12%
Gas discharge	Metal-halide lamp	65–115[47]	9.5–17%
Fluorescent	32 W T12 tube with magnetic ballast	60[38]	9%
Arc lamp	Ultra-high-pressure (UHP) mercury-vapor arc lamp, free mounted	58–78[36]	8.5–11.4%
Fluorescent	9–32 W compact fluorescent (with ballast)	46–75[18][39][40]	8–11.45%[41]

Accuracy of Quantum Sensors Measuring Yield Photon Flux and Photosynthetic Photon Flux​

Abstract. Photosynthesis is fundamentally driven by photon flux rather than energy flux,
but not all absorbed photons yield equal amounts of photosynthesis. Thus, two measures
of photosynthetically active radiation have emerged: photosynthetic photon flux (PPF),
which values all photons from 400 to 700 nm equally, and yield photon flux (YPF), which
weights photons in the range from 360 to 760 nm according to plant photosynthetic
response. We selected seven common radiation sources and measured YPF and PPF from
each source with a spectroradiometer. We then compared these measurements with
measurements from three quantum sensors designed to measure YPF, and from six
quantum sensors designed to measure PPF. There were few differences among sensors
within a group (usually <5% ), but YPF values from sensors were consistently lower (3 %
to 20 %) than YPF values calculated from spectroradiometric measurements. Quantum
sensor measurements of PPF also were consistently lower than PPF values calculated from
spectroradiometric measurements, but the differences were <7% for all sources, except
red-light-emitting diodes. The sensors were most accurate for broad-band sources and
least accurate for narrow-band sources. According to spectroradiometric measurement,
YPF sensors were significantly less accurate (>9% difference) than PPF sensors under
metal halide, high-pressure sodium, and low-pressure sodium lamps. Both sensor types
were inaccurate (>18% error) under red-light-emitting diodes. Because both YPF and
PPF sensors are imperfect integrators, and because spectroradiometers can measure
photosynthetically active radiation much more accurately, researchers should consider
developing calibration factors from spectroradiometric data for some specific radiation
sources to improve the accuracy of integrating sensors
Article Category: Research ArticleOnline Publication Date: Dec 1993
Page(s): 1197–1200Volume/Issue: Volume 28: Issue 12
Copyright: © American Society for Horticultural Science 1993DOI: https://doi.org/10.21273/HORTSCI.28.12.1197

Bruce Bugbee - Wikipedia

en.wikipedia.org

 

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THIS IS THE WHITE LIGHT RANKED BY LUMEN/WATT EFFICIENCY AS TESTED
NOTE: THERE MAY BE OTHER AND THIS DOES NOT LIST REBRANDED
THIS LINK MAY BE MORE HELPFUL FOR YOU AS THIS IS A SNAPSHOT 9/2024

Color rendering index - Wikipedia

en.wikipedia.org

https://download.luminus.com/datasheets/Luminus_MP3030_110F_Datasheet.pdf

J Series® 3030 LEDs - Cree LED

The high-reliability 3030 package is an excellent choice for high efficacy lighting in outdoor areas, indoor harsh environments and horticulture applications. J Series 3030 LEDs feature 6500K-2700K CCTs and 70, 80 & 90 CRI options and are available in three different families, with optimizations...

www.cree-led.com

https://downloads.cree-led.com/files/fs/Cree-LED-JSeries-Feature-Sheet.pdf

3030 LEDs | SAMSUNG LED | Samsung LED Global Website

Samsung 3030 LEDs - Mid Power LEDs. Unmatched market efficacy allows extraordinary productivity, with line-ups to meet various general lighting market needs

led.samsung.com

https://led.samsung.com/about-us/news-events/news/news-detail-49/
Samsung’s New Horticulture LED Lineups:

Product	Size	Light Color	PPF**	PE***	Condition
LM301H	3.0 x 3.0 mm	White	0.54 μmol/s	3.03 μmol/J	65 mA, 25℃
LM561H	5.6 x 3.0 mm	0.50 μmol/s	2.88 μmol/J
LH351H	3.5 x 3.5 mm	White	2.52 μmol/s	2.56 μmol/J	350 mA, 25℃
Royal Blue (450 nm)	2.80 μmol/s	2.80 μmol/J
Deep Red (660 nm)	2.32 μmol/s	3.16 μmol/J
Far Red (730 nm)	0.22 μmol/s	0.33 μmol/J
Horticulture Linear	281.0 x 41.0 mm	White	70.90 μmol/s	2.74 μmol/J	1.2 A, 25℃

• [Data Sheet] LM301H CRI 70v2.22022-04-28DOWNLOAD
• [Data Sheet] LM301H CRI 80v5.42022-04-28DOWNLOAD
• [Data Sheet] LM301H CRI 90v2.22022-04-28DOWNLOAD

 

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RGB LED LINEUP, THIS LAXKS LUMEN DATA IN THE SHEET IS AVAIL ON SPEC SHEETS
DATA HAS NOT BEEN ENTERED TO JOIN IN DM ME A COLLAB REQUEST

 

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LED COBs, Engines, Modules, Strips

 

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Nov 7, 2021
The ultimate lighting solutions for plant growth

SAMSUNG LED

As a forefront pioneer of LED technology, we are committed to providing the most advanced LED component solutions

www.youtube.com

Cree LED

Cree LED, an SGH company, offers one of the industry’s broadest portfolios of application-optimized LED chips and components, leading the industry in performance and reliability. We deliver best-in-class technology and breakthrough solutions for focused applications in high power and mid-power...

www.youtube.com

OSRAM Opto Semiconductors

Driver of innovation in the semiconductor sector Osram Opto Semiconductors is one of the guiding lights both in technological development and in the manufacture of high-quality products. For nearly four decades, the high-tech company has been investing in research and developing new products on...

www.youtube.com

Horticulture Lighting Group

https://horticulturelightinggroup.com The grow lights of choice in gardens & greenhouses for the last 40 years have been HID's. Then the LED revolution started to gain traction from 2011-2015. Yet it just wasn't there. Two premier high-end indoor gardening LED grow light companies merged in...

www.youtube.com

HLG

 

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QB288 V2 & V2 Rspec Board Guide​

QB 288 V2 and QB 288 V2 R spec have 50V-54V DC forward voltage and same driver options will work for all.
DO NOT wire different version boards in parallel. For parallel wiring it has to be all QB 288 V2 R spec or all QB 288 V2 or all QB 288 V1 boards on a driver.
High efficiency boards designed for Horticulture Lighting projects. No Thermal Interface Material is required between the QB board and flat metal heatsink.

Specifications​

• 288pcs Samsung 301H
• Connectors rated 300V 9A
• Estimated LER 321.60 lm/W
• Estimated QER 4.86 µmol/J
• Dimensions 6.833" x 11.25
• Max current per board 3000mA

Flux Characteristics with QB 288 V2 3000K at 55C

VDC	Current (mA)	Watts at Board	Lm/W at Board (55C)	μmoles/joule at Board (55C)
45.72	500	22.86	206	3.00
46.98	1050	49.33	196.10	2.85
47.70	1400	66.78	190.50	2.77
48.96	2100	102.82	180.77	2.63
49.50	2400	118.80	177.50	2.58
49.86	2800	139.60	173.80	2.53

• Allow tolerance of an additional 1V while matching drivers.
• Please use this as a reference only.

May require an Aluminum plate or heatsink if running 50+ watts. Heatsink requirements depends on application and power.
While using multiple boards, series wiring is preferable to avoid thermal runaway if a board gets disconnected.

Popular Driver​

• HLG-120H-54 with 1x QB 288
• HLG-240H-C2100 with 2x QB 288 in series

Driver Notes (Single and Multiple Parallel Boards)​

Non Dimmable

• APC-25-500
• APC-35-700
• GSC18B-350
• GSC25B-500
• GSC40B-700
• LPC-100-1750
• LPC-150-2800
• PLD-25-350
• PLD-40-700B
• PLD-60-1050B
• PCD-25-350
• PCD-40-700B
• PCD-60-1050B
• LPC-150-1400 (180~305VAC only)

Dimmable (Plastic Case)

• LPF-16D-54
• LPF-25D-54
• LPF-40D-54
• LPF-60D-54
• NPF-40D-54
• NPF-60D-54
• NPF-90D-54
• NPF-120D-54

Dimmable (MetalCase)

• HLG-40H-54
• HLG-60H-54
• HLG-80H-54 with 1 or 2 boards for 90 Watts
• HLG-100H-54 with 1 or or more boards for 120 Watts
• HLG-120H-54 with 1 or more boards for 130 Watts
• HLG-150H-54 with 1 or more boards for 160 Watts
• HLG-185H-54 with 2 or more boards for 200 Watts
• HLG-240H-54 with 2 or more boards for 240 Watts
• HLG-320H-54 with 2 or more boards for 320 Watts
• HLG-600H-54 with 4 or more boards for 600 Watts
• ELG-75-C1400 with 1 or more boards for 70 Watts
• ELG-100-54 with 1 or or more boards for 120 Watts
• ELG-150-54 with 1 or more boards for 160 Watts
• ELG-200-54 with 2 or more boards for 200 Watts
• ELG-240-54 with 2 or more boards for 240 Watts

​

Parallel Wiring​

Multiple Boards can be wired in parallel. Different batches of boards may have slightly different voltages. Use only boards from same batch for parallel connection. Do not use different spectrum boards in parallel as they may have slightly different voltages
Tip: Avoid daisy chaining multiple boards as shown in the 2nd image below. This causes first board to handle a large current and can reduce life of board's electrical trace. Wiring as shown in 1st image is preferable.

​

Series Driver Notes​

Non Dimmable

• PLD-40-350B - 2 Boards in series
• PCD-60-500B - 2 Boards in series
• LPC-100-350 - 5 Boards in series
• LPC-100-700 - 2 Boards in series
• LPC-150-1400 (180~305VAC only) - 2 Boards in series
• LPC-150-700 - 4 Boards in series

Dimmable

• HLG-120H-C1400 - 2 Boards in series
• HLG-185H-C1400 - 2 Boards in series
• HLG-240H-C2100 - 2 Boards in series
• ELG-150-C1400 - 2 Boards in series
• ELG-200-C1750 - 2 Boards in series
• ELG-240-C2100 - 2 Boards in series
• HLG-185H-C1050 - 3 Boards in series
• HLG-240H-C1400 - 3 Boards in series
• ELG-240-C1050 - 4 Boards in series
• HLG-240H-C1050 - 4 Boards in series
• HLG-120H-C700 - 4 Boards in series
• HLG-320H-C1400 - 4 Boards in series
• HLG-320H-C1750 - 3 Boards in series

​

Series Wiring​

Maximum 5 Boards can be wired in series. More than 5 boards in series will exceed the recommended maximum voltage of the board connectors and is not recommended.

NOTE: Boards purchased in multiple orders may be from different batches may have different voltages and may not work share equal current if connected in parallel. Use them in series to avoid some boards pulling more current than others.

​

​

Parallel-Series Wiring (Advanced)​

It is possible to have partial benefits of parallel and series together using some driver configurations. For example HLG-320H-C2800 with 2 parallel string of 2 boards in series.

QB288 V2 & V2 Rspec Board Guide

High efficiency boards designed for Horticulture Lighting projects. No Thermal Interface Material is required between the QB board and flat metal heatsink.

horticulturelightinggroup.com

HLG 700 Rspec FR | Ships in 4 weeks

The HLG 700 Rspec FR LED Grow Light will replace a 1000W HID light. 1585 umol/s. 2.5 umol/j. Up to 5x5 flower. Buy NOW!

www.ledgrowlightsdepot.com

QB DIY video or guides? - LEDgardener

Builds Archives - LED Gardener

DIY Archives

chilledgrowlights.com

BIG UP TO THE SHARE OF THIS HAD SOME TIME TO LOOK AT AND THANKS
https://www.customledpcb.com/custom-led-pcb_l7501_p.html
THE HLG QB DIY LOOK INTERESTING BUT DATED ? MAYBE THERE ARE MORE ?
IM STILL LOOKING FOR THE BEST DIY LED BOARDS THAT DISH OUT COMMERCIAL POWER

 

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Conversion - PPFD to Lux​

NOTE: The conversion from PPFD (µmol m-2 s-1) to Lux varies under different light sources. For a complete discussion please see the reference listed below.
PPFD (µmol m-2 s-1) to Lux

Light Source	Conversion Factor
Sunlight	54
Cool White Fluorescent Lamps	74
Mogul Base High Pressure Sodium Lamps	82
Dual-Ended High Pressure Sodium (DEHPS): ePapillion 1000 W	77
Metal Halide	71
Ceramic Metal Halide (CMH942): standard 4200 K color temperature	65
Ceramic Metal Halide (CMH930-Agro): 3100 K color temperature, spectrum shifted to red wavelengths	59
Multiply the PPFD by the conversion factor to get Lux. For example, full sunlight is 2000 µmol m-2 s-1 or 108,000 Lux (2000 ∗ 54).

Lux to PPFD (µmol m-2 s-1)

Light Source	Calibration Factor
Sunlight	0.0185
Cool White Fluorescent Lamps	0.0135
Mogul Base High Pressure Sodium Lamps	0.0122
Dual-Ended High Pressure Sodium (DEHPS): ePapillion 1000 W	0.0130
Metal Halide	0.0141
Ceramic Metal Halide (CMH942): standard 4200 K color temperature	0.0154
Ceramic Metal Halide (CMH930-Agro): 3100 K color temperature, spectrum shifted to red wavelengths	0.0170
Multiply the Lux by the conversion factor to get PPFD. For example, full sunlight is 108,000 Lux or 2000 µmol m-2 s-1 (108,000 ∗ 0.0185).

PPFD to Lux Reference Tables​

Sunlight

If PPFD is:	then, lux is:
10	540
100	5400
200	10,800
300	16,200
600	32,400
1000	54,000
2000	108,000

HPS

If PPFD is:	then; lux is:
10	820
100	8200
200	16,400
300	24,600
600	49,200
1000	82,000
2000	164,000

Metal Halide

If PPFD is:	then; lux is:
10	710
100	7100
200	14,200
300	21,300
600	42,600
1000	71,000
2000	142,000

Fluorescent

If PPFD is:	then; lux is:
10	740
100	7400
200	14,800
300	22,200
600	44,400
1000	74,000
2000	148,000

Definitions​

---

Photometric Units, Illuminance​

Foot-candle: one lumen per square foot. The 16th General Conference on Weights an Measures (CGPM), Oct. 1979, decided that the candela is the luminous intensity of a source emitting monochromatic radiation of frequency 540 x 1012 Hz and radiant intensity 1/683 watt per steradian. This corresponds to 683 lumens per watt of radiation at approximately 555 nm wavelength, which is near the maximum of the standard photopic spectral luminous efficiency curve.
LUX: one lumen per square meter; differs from foot-candle by about a factor of 10.

Lux To Ppfd Calculator - Calculator Academy

Lux To PPFD Calculator Basic Calculator Advanced Calculator Enter any 2 values to calculate the missing variable Lux Conversion Factor PPFD (μmol/m²/s)

calculator.academy

PPFD to Lux Conversion

www.apogeeinstruments.com

Lux - Wikipedia

en.wikipedia.org

Light Intensity Calculator - Calculator Academy

Enter the frequency, the number of photons, incident area, and time into the calculator to determine the light intensity.

calculator.academy

 

[Ca++]

While the tables may be accurate, we should keep in mind that our lux meters are not. Two different meters might agree how many lux the sun is, which is their job. The same meters placed under LED tend to not agree anymore. Mostly because they measure just green, but different widths of the spectrum, or maybe not green, but red. There is no standard. In reality, one reading 50% more than the other, wouldn't be surprising.

As an example, when the ppfd meter reading 600, was replaced with one of my lux meters, it said 20,000 (I like the 2x3=6 relationship of that meter). My other meter said 25,000 which is just 25% different. Other meters have been knocking on 35,000 which is near double my 20,000. There is a lack of consistency, that makes using an unknown lux meter, an unknown reasult.

 

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While the tables may be accurate, we should keep in mind that our lux meters are not. Two different meters might agree how many lux the sun is, which is their job. The same meters placed under LED tend to not agree anymore. Mostly because they measure just green, but different widths of the spectrum, or maybe not green, but red. There is no standard. In reality, one reading 50% more than the other, wouldn't be surprising.

As an example, when the ppfd meter reading 600, was replaced with one of my lux meters, it said 20,000 (I like the 2x3=6 relationship of that meter). My other meter said 25,000 which is just 25% different. Other meters have been knocking on 35,000 which is near double my 20,000. There is a lack of consistency, that makes using an unknown lux meter, an unknown reasult.

Report I read a few hours ago set the average instrument at 17% deviation.
As you say if your measuring a 25% difference then that would be a type of standard ? The deviation ?
the median would be closest to no error, or in that case if you used that number 12.5% on adjustment
Bit confusing, what is a lighting standard which is reliable, that can be used as a calibration tool ?

" lux meters" would have to be a lux standard then conversion formulas can be used across the board

https://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.250-95.pdf

maybe the matter has already been explored but how shall we implement it ?


@Ca++ there are many variables we need to address to make this a apples to apples thread
certainly where we are now is apples to oranges even among manufacturers there is sporadic standards
Besides simple PPFD PFD LUX LUMENS there are many other factors such as wavelength CRI
In the far sight is strain selection, yield in grams/watt, potency total cannabinoid content of that gram?

How much did it cost us to produce that gram figuring equipment, time, energy.....etc
Many variables that im sure were all considering ?

Max Planck - Wikipedia

en.wikipedia.org

I envy the one who cares not and grows for joy and superior product regardless $
Life would be so much easier for us ?... Do love to geek on details !
Maybe this is some of what you are considering? Appreciate you mentioning this!
The one paper DOI posted earlier is focused on this exact topic have to dig it up and add it to this post
Green light perfect standard red light error levels and calibration just as you have pointed out


https://atslab.com/calibrations/light-meter-calibrations/


This document describes the updated photometric calibration procedures for luminous intensity (candela; cd), illuminance (lux; lx), total luminous flux (lumen; lm), luminance (cd/m2 ), color temperature (Kelvin; K), and luminous exposure (lx·s, cd·s). Throughout this document, uncertainty statements follow the NIST policy given by Taylor and Kuyatt [5], which prescribes the use of an expanded uncertainty with a coverage factor k = 2 for uncertainties of all NIST calibrations. Descriptions for the individual standards and calibrations available from NIST covered by this document, as of October 2017, are listed and explained in Section 2. Updated information about calibration services and prices are published periodically in the NIST Calibration Services Users Guide and Fee Schedule [6]. The material presented in this document describes photometric calibration facilities and procedures as they existed at the time of publication. Further improvement of photometric calibration facilities and procedures are underway. Additional documents will cover new photometric calibration procedures for average LED intensity (candela; cd), LED total luminous flux of LEDs (lumen; lm), colorimetry of LEDs, and spectrally integrated total radiant flux of LEDs (watt; W), along with total spectral radiant flux calibration procedures for incandescent light sources

If we could all buy a perfect led bulb pack from the same batch from the same manufacturer
We run that led bulb of the same color temp in the same voltage same amp circuit
We measure each bulb in the pack with out app on our separate phones, what would the difference be?
Of course e need spotless cleaned glass over our CMOS sensors...

Theres alot to achieving quality data ?

Theory of relativity - Wikipedia

en.wikipedia.org

Einstein and Planck your good company love the way you think
Its not the answers that drive us its the questions

Calibrating the Light meter, some quick notes - Frank Doorhof

Blogpost about how to calibrate your light meter

frankdoorhof.com

Black-body radiation - Wikipedia

en.wikipedia.org

An object that absorbs all radiation falling on it, at all wavelengths, is called a black body.

Carbon black - Wikipedia

en.wikipedia.org

• Lamp black was traditionally produced by collecting soot from oil lamps.

Strategy on standard LEDs in NIST calibration services

Some NIST calibration services issue calibrated artifacts and others calibrate artifacts submitted by customers. We decided not to prepare and issue “standard LEDs” because there are so many types of LEDs and new types of LEDs are continuously being introduced, and thus, any standard LED we might develop would not satisfy many customers and would quickly become obsolete. We are committed to providing calibrations for any type of LEDs submitted by our customers, which can then be used as reference standard LEDs of the type needed in the customer’s lab. Customers are responsible to ensure the quality of LEDs submitted to NIST for calibration. Information on the NIST photometric calibration services is available on the website [14] or by contacting the authors.

 

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How to Calibrate Photone​

By calibrating you can align Photone’s reading to a reference

Do You Need To Calibrate Photone?​

Calibration is an advanced use case, requires some know-how, and is always optional. Make sure to have read our guide on how to measure accurately before continuing:
How to Measure Accurately
Learn what affects the accuracy of the Photone Grow Light Meter

If calibrating makes sense depends on if your device already comes with a default calibration. Go to the app’s settings (-icon on the top right) and press “Calibrate Photone”. The screen will indicate if your device has a default calibration (look for the -icon) or not (-icon).

Device With Default Calibration​

Congratulations, your device comes with a default calibration. Calibration is not recommended. Use the calibration feature only, if you wish to align Photone’s measurements to a high-quality reference light meter. Read along to find out what makes a good reference.

Device Without Default Calibration​

Your device does not come with a default calibration. Calibration is recommended, if you don’t measure what you expect and you have a reference you trust at hand. Read along to find out what makes a good reference.

How Calibration Works​

By calibrating you align a meter’s reading to a reference. Let’s say Photone measures 1230 μmol/m²/s of PPFD under your grow light, but your friend’s high-quality PAR meter says 1270 which is 3.25% more. You can now calibrate Photone with your friend’s meter as a reference. This will adjust Photone’s measurement values by +3.25% making it read equally to the reference.

This process only works, if a meter measures linearly (meaning that e.g. doubling the light intensity results in double the measurement). But rest assured, unlike other light meter apps Photone is built to measure linearly on all supported devices.

What Makes a Good Calibration Reference​

To calibrate, you need a reference in which you trust providing a measurement value for Photone to be aligned to. A reference could be either another light meter or a light source with a known intensity (e.g. as stated in a light output chart).

Reference Light- / PAR-Meter​

You can use any high-quality light meter that is able to measure illuminance (lux or fc) or PPFD (μmol/m²/s) as a reference. You can also use another device running Photone.

Beware of cheap light meters. We have tested many light meters and found that, as a rule of thumb, models costing less than $150 USD are awfully inaccurate, especially when measuring grow lights.

Multiple lux-meters under the same grow light showing significantly different values

Reference Light Output Chart​

Most grow lights come with a spec sheet (see the example image below) that shows how much light intensity can be expected in a specific environment (e.g. a 2x2 ft grow tent), at a given distance (e.g. 12", 18", 24"), on a given point (e.g. center square) and power setting (e.g. usually full power unless noted otherwise). You can then use these parameters to calibrate Photone if you can replicate the manufacturer’s setup.

Note that you’d need to exactly reproduce the setup chosen in the spec sheet and you need to trust your grow light’s manufacturer. We found that some manufacturers like to inflate their values provided on the spec sheets.

An example spec sheet indicating how much PPFD can be expected at a given distance

How To Calibrate​

With a reference value at hand, calibration is fairly easy. First, make sure that your lamp is warmed up and its light output has become stable. Especially fluorescent (FL) or HID-lamps (HPS, CMH, MH) have a long warmup time of roughly 15 minutes. You can test if your lamp is stable by monitoring the current measurement value (it should remain equal over one minute). Then, follow the instructions the app’s instructions after having pressed “Calibrate Photone”.

Video Guides​

To illustrate the calibration procedure, we've created the following videos showing the required steps for you:
Using a light output chart as a reference

Using a light meter as a reference

Using another device running Photone as a reference

Standard 120V 15,20amp

15$ for 20$ we have a standard ?
Theres the issue of ambient light sources and shadows, getting accurate reading etc ...

$4

Upgraded Watt Meter Power Meter Plug Home Electricity Usage Monitor, Electrical Usage Monitor Consumption, Energy Voltage Amps Kill Meter Tester with Backlight, Overload Protection, 7 Modes Display​

Visit the MECHEER Store

How to Calibrate Photone

By calibrating you can align Photone’s reading to a reference

growlightmeter.com

Measurement, calibration and measurement uncertainty of OSRAM Opto Semiconductor LEDs (1).pdf

drive.google.com

The Best Light Meter App For Plants in 2023

We know there are many light meter apps out there and choosing the best one for your plants may seem overwhelming. We know what matters for a light meter and routinely test and compare the most promising light meter apps. This article is our summary of it.

growlightmeter.com

Photone - Grow Light Meter

The grow light meter app to measure PAR / PPFD, DLI, lux / fc, or Kelvin with your iOS or Android phone. Including PPFD meter and DLI conversion for plants.

growlightmeter.com

 

[acespicoli]

This data is a little unbelievable...

DLI Meters | Apogee Instruments

www.apogeeinstruments.com

Three Models

• DLI-400: Lowest-cost option is accurate for measuring 400-700 nm only in sunlight and under some broadband light sources.
• DLI-500: Full-spectrum is accurate for measuring 400-700 nm under all light sources including LEDs.
• DLI-600: ePAR is accurate for measuring the newly discovered extended PAR (ePAR) 400-750 nm range under all light sources.

https://spacemath.gsfc.nasa.gov/Sensors/GuideLight.docx#:~:text=Smartphones%20use%20light%20meters%20to,light%20that%20falls%20on%20them.

From NASA Space Math

Active-pixel sensor - Wikipedia

en.wikipedia.org

In applications with less exacting quality demands, such as consumer and professional digital cameras, active pixel sensors, also known as CMOS sensors (complementary MOS sensors), are generally used.

Charge-coupled device - Wikipedia

en.wikipedia.org

In a CCD image sensor, pixels are represented by p-doped metal–oxide–semiconductor (MOS) capacitors. These MOS capacitors, the basic building blocks of a CCD,[1] are biased above the threshold for inversion when image acquisition begins, allowing the conversion of incoming photons into electron charges at the semiconductor-oxide interface; the CCD is then used to read out these charges.

Although CCDs are not the only technology to allow for light detection, CCD image sensors are widely used in professional, medical, and scientific applications where high-quality image data are required.

Image sensor - Wikipedia

en.wikipedia.org

A back-illuminated sensor contains the same elements, but arranges the wiring behind the photocathode layer by flipping the silicon wafer during manufacturing and then thinning its reverse side so that light can strike the photocathode layer without passing through the wiring layer.[7] This change can improve the chance of an input photon being captured from about 60% to over 90%,[8]


Sony, which announced the first stacked sensor in January 2012, claims a 30% increase in light captured.[20]

DOES THIS POINT TO MANY VARIABLE S, FRONT FACING REAR FACING CAMERAS ?
ALSO SENSOR TYPES VARY

List of large sensor camera phones - Wikipedia

en.wikipedia.org

Also note that the Sony Xperia PRO-I does not qualify for this list, because it only uses 60%[a] of its 1.0-type sensor.[1] The latest Leica Leitz and Sharp Aquos R series phones do qualify because, despite using only 94%https://en.wikipedia.org/wiki/List_of_large_sensor_camera_phones#cite_note-3 of their 1.0-type sensors[2][3] (with 4:3 aspect ratio), they maintain the same crop factor (2.7) and diagonal (1″) as a 1.0-type sensor with 3:2 aspect ratio, since that is the image circle for which their lenses were originally designed.


CAN WE CALIBRATE TO NOON DAY SUNLIGHT ON A CLEAR DAY ?
The Sun is about 95 million miles away in summer, but just 92 million in winter.
WE NEED A FREE TO INEXPENSIVE SOLUTION THAT IS ACCESSIBLE TO EVERYONE

BESIDES LOOKING INTO EXPENSIVE SPECIALTY EQUIPMENT,
A CALIBRATED APP MAY FILL THE GAP

 

[acespicoli]

Natural Sunlight Intensity​

There is a lot of information available about the light intensity needs of plants, so when purchasing grow lights, it is a relatively simple matter to specify the wattage we will need for our grow areas. However, if we are looking to supplement natural sunlight or determine how much shade we need for a greenhouse, it would help if we knew just how much natural sunlight intensity we have to work with in the first place.
At the equator, the sun’s intensity gives us a Photosynthetic Photon Flux (PPF) of 2000 µmol/m2/sec of light, which is roughly equivalent to 10,200 foot candles or 108,000 lux. As we move away from the equator however, the relative thickness of the atmosphere the light must travel through increases, and the angle of incidence “spreads out” the light, both of which decrease the light intensity. Not only does our location affect the sunlight intensity, but the time of year does, as well, as the sun is lower in the sky in winter than in summer. Fortunately, there are some simple tools that can help.
The University of Oregon Solar Radiation Monitoring Laboratory has an online Sun Chart Program that allows us to generate a solar elevation chart for your specific location, providing data for month of the year, as well as time of day. The chart for your location will look something like this:

From this chart we can see, for example, that at noon on December 21st, for this specified location, the sun will only reach a maximum of 33° in elevation, while on June 21st, it can reach 80°.
Unfortunately, the relationship between solar elevation and solar intensity is a sine function and not a linear one. Fear not! By simply generating your own Sun Chart and entering the solar elevation (in degrees) in the calculator below, the maximum light intensity possible is provided.

Solar Instensity Calculator​

Determine the Maximum Sunlight Intensity Based Upon Your Location


Solar Elevation Angle
(degrees, from the "Sun Chart" you generated above)*



Maximum Solar Intensity (Approximate)

Units*
PPF
Foot-Candles
Lux


https://solardata.uoregon.edu/SunPathChart.html



So you can see that for this location, the maximum summer sunlight intensity is about 1970 µmol/m2/sec, or only about 1.5% below that of the equator, while in winter it’s only 1090 µmol/m2/sec, or 45% less.

Redefining the Second​

Because of the advantages of optical clocks in terms of accuracy, speed of comparison and remote synchronization, it is to be expected that in the not too far future the cesium clock as the fundamental timing reference will be replaced with an optical clock. This will effectively mean that the second as a fundamental SI unit will be redefined based on such a clock, then referring to an optical frequency rather than to a microwave frequency.

SUNLIGHT CLOCK... ? PRECISE STANDARDS ARE A SCIENCE

 

[acespicoli]

Sine Wave Power​

In the U.S., utility companies provide power to households and offices by distributing single phase alternating current (AC) power at a frequency of 60 Hz. Electrical power can be graphically depicted as a sine wave whereby the electrical signal alternates from +120 volts to -120 volts at a rate of 60 times per second (60 Hz). To enable more efficient operation of large, heavy equipment, utility companies provide commercial and industrial locations with three phase AC power which consists of three overlapping sine waves offset by 120 degrees.
Although utility companies strive to distribute 100% sine wave power, many factors can introduce electrical noise into the AC power signal in the form of sine wave distortions and as voltage sags, surges, spikes, or other irregularities. Sine wave power is important for the optimal functioning of sensitive desktop computers and related peripheral equipment. Without sine wave power output, microprocessor-based equipment can become inoperative or sustain damage from power signal distortions.

REASONS WHY YOUR LIGHT READINGS FLUCTUATE DURING A SAMPLE

 

[Ca++]

I like this pic you found

Is the light
A, 3600
B, 4900
C, 6200
D, 6800

This looks like a pink light QB. We could presume it's made from red and blue. Also, that meter A is looking only at pure green. With it using very tight filtering to remove other colours. In such an instance, the meter presumes all other colours are about as bright as the green it can see. Based on it's idea of what sunlight presents on a graph. So low levels of green, must in the meters opinion, mean low levels of red and blue. It's guess guessing.
The other meters may be displaying lesser filtering, or even using something other than pure green. The story of how the meters work, gets more complex until we reach a meter worth 500$ or more, that gives you a full spectral graph. A normal PPDF meter is now little more than 50$ at the low end of the market. What was highly specialised kit a few years ago, is finally getting close to mass produced consumer gear. As it should. A lux meter is 10$ if you were to buy my favourite. A cheap smart phone is 50$. What should a PPFD meter cost.
I don't expect a lab grade meter for 50$ but we are not working for NASA. Most of the time, we can't keep a hand steady enough to read to the nearest umol. We use these in the field, not on a bench. I accept a 5% deviation from the truth, as not really mattering. What slowed development, is difficulty reading 660nm and above. Even some fancy ppfd meters are guessing this, which is why we need to add correction factors, even after paying hundreds. It's important to pick the accuracy you need, rather than what's available.

You know I probably used a few lux meters, that had been beside PPDF meters to check their usefulness. I have to do some math, but it's only X3. If my meter says 20,000 I do 2x3=6 and I know it's 600umol not 60 or 6000. I can forget the zeros. This puts me very close, and competative with how close expensive meters are. Once you factor in how different LED CT changes results, and is being ignored. Non of it is really that true.
I will snag a meter that reads in umol, once a few are under 50$ and featured on youtube

 

[BerryManilow]

Don't see Grower's Choice listed yet.

I've been running the ROI-720 with the additional full spectrum UV bars.

Used HPS & MH for veg and flower for about 20 years. Waited to make the switch to LED until a few years ago.

First upgraded my veg lights to Viparspectra P1000 and they are some solid lights for veg. Zero issues and only good things to say about them. Super lightweight and covers a decent sized footprint. Healthy plants and healthy clones since I switched.

For flowering I've been using the Growers Choice for about 3 years now. I've heard their support isn't the best and some horror stories about the lights dying, but so far so good.

Biggest yield was around 2.5 lbs per light / 1.75g/w. Not in a commercial setting so those numbers are a huge difference compared to HPS.

The UV has brought out some of the frostiest flowers I've ever seen. Aeroponics is probably the frostiest, but coco and hydro are right behind.

 

[acespicoli]

Hi BerryManilow, GROWERS CHOICE has been added to the poll choice's
thanks for the shout out for GC

 

[acespicoli]

I like this pic you found

Is the light
A, 3600
B, 4900
C, 6200
D, 6800

This looks like a pink light QB. We could presume it's made from red and blue. Also, that meter A is looking only at pure green. With it using very tight filtering to remove other colours. In such an instance, the meter presumes all other colours are about as bright as the green it can see. Based on it's idea of what sunlight presents on a graph. So low levels of green, must in the meters opinion, mean low levels of red and blue. It's guess guessing.
The other meters may be displaying lesser filtering, or even using something other than pure green. The story of how the meters work, gets more complex until we reach a meter worth 500$ or more, that gives you a full spectral graph. A normal PPDF meter is now little more than 50$ at the low end of the market. What was highly specialised kit a few years ago, is finally getting close to mass produced consumer gear. As it should. A lux meter is 10$ if you were to buy my favourite. A cheap smart phone is 50$. What should a PPFD meter cost.
I don't expect a lab grade meter for 50$ but we are not working for NASA. Most of the time, we can't keep a hand steady enough to read to the nearest umol. We use these in the field, not on a bench. I accept a 5% deviation from the truth, as not really mattering. What slowed development, is difficulty reading 660nm and above. Even some fancy ppfd meters are guessing this, which is why we need to add correction factors, even after paying hundreds. It's important to pick the accuracy you need, rather than what's available.

You know I probably used a few lux meters, that had been beside PPDF meters to check their usefulness. I have to do some math, but it's only X3. If my meter says 20,000 I do 2x3=6 and I know it's 600umol not 60 or 6000. I can forget the zeros. This puts me very close, and competative with how close expensive meters are. Once you factor in how different LED CT changes results, and is being ignored. Non of it is really that true.
I will snag a meter that reads in umol, once a few are under 50$ and featured on youtube

Is the light
A, 3600
B, 4900
C, 6200
D, 6800

IMO A WOULD BE THE CLOSEST KELVIN VALUE FOR THAT EXAMPLE
5K BEING DAYLIGHT AND ABOVE BEING BLUE SPECTRUM

Reproducing the color of real world light.pdf

drive.google.com

RGB COLOR PICKER REMEBER A PORTION OF THE POPULATION ARE COLOR BLIND

W3Schools.com

W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more.

www.w3schools.com

RGB produces white by mixing the three optic primary colors (Red, green, and blue) in a 1:1:1 ratio.
IF WE MIX ALL PAINT COLORS WE GET BLACK, WHAT IF WE MIX ALL LIGHT COLORS ?
IS IT REALLY WHITE OR DO OUR EYES JUST PERCEIVE IT AS WHITE LIGHT?
WHITE REFLECTS LIGHT, BLACK ABSORBS LIGHT ?

PPFD=Lux∗CF

Lux to PPFD conversions​

https://spacebuckets.com/docs/lux-ppfd-conversion

67 lux = 1 µmol/m2/sec as a generalization for all white LEDs and not taking CRI into account. The following conversions will get you within 10% for white light.​

• 55 lux = 1 µmol/m2/sec (sunlight)
• 63 lux = 1 µmol/m2/sec (white light - CRI 90)
• 70 lux = 1 µmol/m2/sec (white light - CRI 80)
• 80 lux = 1 µmol/m2/sec (HPS)

Comparing different lighting spectrums

Dependencies have been shown and conversion factors have been determined, which allow to estimate PPFD, YPFD and radiometric power density of white LED light according to the known illumination in lux. The most adequate estimation of the photosynthetically active white light flux is achieved if one measures the illumination E in kilolumens using a luxmeter, neglects the influence of spectral parameters, and estimates the PPFD of white LED light according to the formula: PPFD (μmol/s/m2) = 15·E (klx). Anton Sharakshane, An easy estimate of the PFDD for a plant illuminated with white LEDs

Bridgelux phosphor guide​

This section covers spectrum charts, conversion factors, and color ratios of the Bridgelux COB array LEDs. The conversion factor is luminous flux (lux) to photosynthetic photon flux density (PPFD) in uMol/m2/sec (micro moles per square meter per second) of PAR (photosynthetic active radiation 400-700nm). This is so that low cost lux meters can be used as plant lighting meters. The color ratios will not add up to 100. Blue is 400-499nm, green is 500-599nm, red is 600-699nm, far red is 700-799nm. The average wavelength of phosphor pump blue LEDs in my samples was about 453.5nm.

THIS ABOVE CHART HAS BEEN ADDED
TO THE CONVERSION SPREADSHEET FOR OUR LED WORKGROUP

https://drive.google.com/file/d/1rUK7BYtsmrdWx0hAquhIg9gze2O5t8Sp/view?usp=sharing

THERE ARE METERS THAT READ RGB AND GIVE YOU THAT OUTPUT IN THE SAME
PAR (photosynthetic active radiation 400-700nm). THIS IS THE METER RANGE USUALLY
NEAR AND FAR ENDS OF THE SPECTRUM ARE MANY TIMES NOT BEING MEASURED

BROTHER I ADDED, AM ADDING SOME CF AND FC TO THE SPREAD SHEET ON THE
CF TAB NEAR THE BOTTOM ALSO SOME LINKS FOR ASSOCIATED READING TO KEEP EVERYONE UP TO SPEED

CAN EVERYONE READ EVERY NUMBER IN THE CIRCLE?


TAKE A PICTURE LET GIMP GIVE YOU THE RGB WITH COLOR PICKER WHAT DOES THIS TELL US?

5.3. Color Picker

#1 Online Color Blind Test | Test for Color Vision Deficiency

Take the # 1 online color blind test at EnChroma to detect color vision deficiency. Assess your vision & find out if you're color blind in less than 2 minutes!

enchroma.com

 

[acespicoli]

AS FAR AS RGB OR ANY OF THIS FOR PPFD WHAT WERE REALLY CONCERNED WITH IS
HOW MANY PHOTONS ARE REACHING OUR PLANTS TO MAKE ENERGY IN THE PLANT

SOME PHOTONS ARE FAST MOVING AND OTHERS ARE SLOW MOVING AND THIS IS WHERE
nm COMES INTO PLAY SOME ARE USED IN CHLOROPHYLL PRODUCTION.

OTHERS MAY BE SO ENERGETIC THEY PASS RIGHT THRU THE LEAF

Photosynthetically active radiation - Wikipedia

en.wikipedia.org

Chlorophyll - Wikipedia​

Chlorophyll is any of several related green pigments found in cyanobacteria and in the chloroplasts of algae and plants. ... Its name is derived from the Greek ...

Chlorophyll a (Chl-a)​ Chlorophyll a ... Chlorophyll a is a specific form of chlorophyll used ...

Chlorophyll b​ Chlorophyll b ... Chlorophyll b is a form of chlorophyll. Chlorophyll ...

Chlorin​ The name chlorin derives from chlorophyll. Chlorophylls are ...

Chlorophyll d​ Chlorophyll d (Chl d) is a form of chlorophyll, identified by Harold ...

Chlorophyll c​ Structure · Chlorophyll c1 molecule. Names. IUPAC name. [(2E)-3 ...

THIS IS WHY 400-700nm concern us and why we care how many PPFD hit a leaf
@Ca++ some will definately benefit from the fact you know these details and the discussion

For accurate PPFD and all the variables we need a tool QS ... ?
This is in essence doing what our girls do capture electrons or photons, basic is they harvest energy
Your smart phone camera sensor is functioning in a similar way

Photon - Wikipedia

en.wikipedia.org

Quantum sensor - Wikipedia

en.wikipedia.org

In photonics and quantum optics, photonic quantum sensing leverages entanglement, single photons and squeezed states to perform extremely precise measurements.

You know this all gets very technical, if you wanna go down the rabbit holes.

Let there be light - What's the best grow lights, growing ?

💡 Let there be light 💡 https://www.icmag.com/threads/led-growers-unite-who-makes-the-best-led-and-how-long-has-it-lasted-cast-your-vote.18132107 nugzz https://docs.google.com/document/d/1LH4V1AuXVsMoDmwFp3_AKUzquW4ieJBt8w-GfAYXE60/edit?usp=sharing 💡 OK SO REALIZING THAT DUE TO GROWTH STAGE...

www.icmag.com

alot of the tech is explored in this thread ^
essentially we need to know certain things about a LED purchase

It may be time we make that list ?

 

[acespicoli]

All feedback is welcome as well as poll is always open for edits!
For someone who just came to this thread and is looking for their first LED light.
What questions would you seasoned veterans recommend they answer pertaining to their situation.

I wanna summarize this :
"who-makes-the-best-led"
in the first few pages with a post that has the details the ICfam needs to make a educated lighting choice
So they will have the poll which shows the most popular LED in 2024
and why its the choice of LED cannabis PRO's

1. Grow room size
2. Growth stage of tent/room seedling, clone, veg flower. Multi room ?
3. Budget for the LED purchase
4. Cycle operating costs, is this a concern
5. Do you want the most light "PPFD" possible
6. Do you want the most efficient light "lu/watt"
7. What is the company with the best warranty reputation on diodes and drivers, units
8. What is the best purchase for my money based on my use

1. Is building a DIY gonna give me a edge on total PPFD or warranty
2. Is this gonna fulfill my production needs what kinda gram/watt can I achieve with the right genetics
3. Do I need C02, is there inexpensive ways of making generating CO2
4. How much PPFD do I need ?
5. Should I run my dimmer at 100%
6. Are high temps gonna kill my LED fixture

Hopefully yall can add some more common questions

At the equator, the sun's intensity gives us a Photosynthetic Photon Flux (PPF) of 2000 µmol/m2/sec of light, which is roughly equivalent to 10,200 foot candles or 108,000 lux.
Use Calculator below to convert instantaneous PPFD µmol m-2 s-1 to DLI photosynthetic photon flux density in mol m-2 d-1

Enter PPFD : 2000
Enter Hours : 18

DLI: 129.60​

https://www.waveformlighting.com/horticulture/daily-light-integral-dli-calculator

Convert Lux to PPFD - Online Calculator | Waveform Lighting

Online calculator to convert illuminance (lux) to PPFD (micromoles per second per meter squared).

www.waveformlighting.com

Things to know
Typical CO2 levels for growing cannabis under high-PPFD (Photosynthetic Photon Flux Density) lights range from 400-1400 ppm

Without c02 enrichment yours is likely 400ppm

Variation at equator…Day length variation at equator

There are always twelve hours of daytime and twelve hours of night-time at the equator, except for two minor effects that increase daytime by about eight minutes.

Tropical strains are flowering faster at less than 12/12 hours of light 11 or even 10

2019CannGuide_GPN1218_LightingCannabis.pdf

drive.google.com

Daily light integral - Wikipedia

en.wikipedia.org

Some of the top end LED fixtures deliver this 2000 µmol/m2/sec