growmore15
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iLuminar Lighting, ThinkGrow, Fohse, Flexstar, Fluence, Photobio, Dutch Lighting Innovations, Gavita, GroPros and a few others.
LED Growers Unite, Who makes the BEST LED and how long has it lasted ? Cast Your Vote!!!
- Thread starter acespicoli
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acespicoli
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Colours of Transition Metal Ions in Aqueous Solution
This graphic looks at the colours of transition metal ions when they are in aqueous solution (in water), and also looks at the reason why we see coloured compounds and complexes for transition metals. This helps explain, for example, why rust...
www.compoundchem.com
Visible Spectra of the Elements
Spectroscopy - Wikipedia
| |||
|---|---|---|---|
| Colour | Wavelength (nm) | Frequency (THz) | Photon energy (eV) |
| violet | 380–450 | 670–790 | 2.75–3.26 |
| blue | 450–485 | 620–670 | 2.56–2.75 |
| cyan | 485–500 | 600–620 | 2.48–2.56 |
| green | 500–565 | 530–600 | 2.19–2.48 |
| yellow | 565–590 | 510–530 | 2.10–2.19 |
| orange | 590–625 | 480–510 | 1.98–2.10 |
| red | 625–750 | 400–480 | 1.65–1.98 |
Electromagnetic spectrum - Wikipedia
Diagnose and Treat Cal Mag Deficiency in Vegging & Flowering
This post is an all-rounded guide on the causes, symptoms, and treatments of Cal Mag deficiency weed, including specific signs in veg and flowering stages.
www.spider-farmer.com
K, Ca, Mg 4-2-1 ratio
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acespicoli
Well-known member
Photosynthesis (/ˌfoʊtəˈsɪnθəsɪs/ FOH-tə-SINTH-ə-sis)[1] is a system of biological processes by which photosynthetic organisms, such as most plants, algae, and cyanobacteria, convert light energy, typically from sunlight, into the chemical energy necessary to fuel their metabolism.
en.wikipedia.org
Plant nutrition is the study of the chemical elements and compounds necessary for plant growth and reproduction, plant metabolism and their external supply. In its absence the plant is unable to complete a normal life cycle, or that the element is part of some essential plant constituent or metabolite. This is in accordance with Justus von Liebig's law of the minimum.[1] The total essential plant nutrients include seventeen different elements: carbon, oxygen and hydrogen which are absorbed from the air, whereas other nutrients including nitrogen are typically obtained from the soil (exceptions include some parasitic or carnivorous plants).
Plants must obtain the following mineral nutrients from their growing medium:[2]
en.wikipedia.org
Conventional LEDs are made from a variety of inorganic semiconductor materials, the following table shows the available colors with wavelength range, voltage drop and material:
Most commonly used semiconductor materials are crystalline inorganic solids. These materials are classified according to the periodic table groups of their constituent atoms.
The word crystal derives from the Ancient Greek word κρύσταλλος (krustallos), meaning both "ice" and "rock crystal",[3] from κρύος (kruos), "icy cold, frost".[4][5]
Examples of large crystals include snowflakes, diamonds, and table salt.
en.wikipedia.org
Spectrum of the visible wavelengths at approximately sea level; illumination by direct sunlight compared with direct sunlight scattered by cloud cover and with indirect sunlight by varying degrees of cloud cover. The yellow line shows the power spectrum of direct sunlight under optimal conditions. To aid comparison, the other illumination conditions are scaled by the factor shown in the key so they match at about 470 nm (blue light).
en.wikipedia.org
@dogzter my plants always look happier on cloudy days, sun is best light source when available 
Made me think of your suggestion in the prior thread 
One of the most striking predictions of quantum physics is that matter can be generated solely from light (i.e., photons), and in fact, the astronomical bodies known as pulsars achieve this feat.
phys.org
LED use requires attention to nutrient deficiency (lack of)
K, Ca, Mg, 4-2-1 ratio to prevent antagonism
Photosynthesis - Wikipedia
Plants must obtain the following mineral nutrients from their growing medium:[2]
- The macronutrients: nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), sulfur (S), magnesium (Mg), carbon (C), hydrogen (H), oxygen (O)
- The micronutrients (or trace minerals): iron (Fe), boron (B), chlorine (Cl), manganese (Mn), zinc (Zn), copper (Cu), molybdenum (Mo), nickel (Ni)
Plant nutrition - Wikipedia
| Color | Wavelength (nm) | Voltage (V) | Semiconductor Material | |
|---|---|---|---|---|
| Infrared | λ > 760 | ΔV < 1.9 | Gallium arsenide (GaAs) Aluminium gallium arsenide (AlGaAs) | |
| Red | 610 < λ < 760 | 1.63 < ΔV < 2.03 | Aluminium gallium arsenide (AlGaAs) Gallium arsenide phosphide (GaAsP) Aluminium gallium indium phosphide (AlGaInP) Gallium(III) phosphide (GaP) | |
| Orange | 590 < λ < 610 | 2.03 < ΔV < 2.10 | Gallium arsenide phosphide (GaAsP) Aluminium gallium indium phosphide (AlGaInP) Gallium(III) phosphide (GaP) | |
| Yellow | 570 < λ < 590 | 2.10 < ΔV < 2.18 | Gallium arsenide phosphide (GaAsP) Aluminium gallium indium phosphide (AlGaInP) Gallium(III) phosphide (GaP) | |
| Green | 500 < λ < 570 | 1.9[180] < ΔV < 4.0 | Indium gallium nitride (InGaN) / Gallium(III) nitride (GaN) Gallium(III) phosphide (GaP) Aluminium gallium indium phosphide (AlGaInP) Aluminium gallium phosphide (AlGaP) | |
| Blue | 450 < λ < 500 | 2.48 < ΔV < 3.7 | Zinc selenide (ZnSe) Indium gallium nitride (InGaN) Silicon carbide (SiC) as substrate Silicon (Si) as substrate — (under development) | |
| Violet | 400 < λ < 450 | 2.76 < ΔV < 4.0 | Indium gallium nitride (InGaN) | |
| Purple | multiple types | 2.48 < ΔV < 3.7 | Dual blue/red LEDs, blue with red phosphor, or white with purple plastic | |
| Ultraviolet | λ < 400 | 3.1 < ΔV < 4.4 | Diamond (235 nm)[181] Boron nitride (215 nm)[182][183] Aluminium nitride (AlN) (210 nm)[184] Aluminium gallium nitride (AlGaN) Aluminium gallium indium nitride (AlGaInN) — (down to 210 nm)[185] | |
| White | Broad spectrum | ΔV = 3.5 | Blue/UV diode with yellow phosphor |
The word crystal derives from the Ancient Greek word κρύσταλλος (krustallos), meaning both "ice" and "rock crystal",[3] from κρύος (kruos), "icy cold, frost".[4][5]
Examples of large crystals include snowflakes, diamonds, and table salt.
Light-emitting diode - Wikipedia
Spectrum of the visible wavelengths at approximately sea level; illumination by direct sunlight compared with direct sunlight scattered by cloud cover and with indirect sunlight by varying degrees of cloud cover. The yellow line shows the power spectrum of direct sunlight under optimal conditions. To aid comparison, the other illumination conditions are scaled by the factor shown in the key so they match at about 470 nm (blue light).
Sunlight - Wikipedia
Made me think of your suggestion in the prior thread
One of the most striking predictions of quantum physics is that matter can be generated solely from light (i.e., photons), and in fact, the astronomical bodies known as pulsars achieve this feat.
Let there be matter: Simulating the creation of matter from photon–photon collisions
A team led by researchers at Osaka University and University of California, San Diego has conducted simulations of creating matter solely from collisions of light particles. Their method circumvents what would otherwise be the intensity limitations of modern lasers and can be readily implemented...
LED use requires attention to nutrient deficiency (lack of)
K, Ca, Mg, 4-2-1 ratio to prevent antagonism
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acespicoli
Well-known member
If you think of the others please share will add, and hopefully launch another poll in the near future
To give all manufacturers a equal chance at 1st place,
Also will be interesting to see what diode the top picks are using ?
