LED and BUD QUALITY

[Rgd]

the organic led grown weed I am smoking is awesome
and its just circa 2013 Samsons 3000-3500k
been using since then..

made so many diodes for the 600w driver that there is never bleaching or need to ever turn it down

cobs bleached when too close..

in a few weeks I will smoke test the hps grown ones..one wary red hps and one normal
t
hey are not looking shabby

 

[CocoNut 420]

1400umol
That is on the high side, but in the safe zone. Perhaps you went past 1700umol when you had problems.


That Philips quote, about photo-bleaching not being related to light, is primary school level wrong. They must be having some sort of language breakdown. A misdirection, from them separating the issue into two camps. The language used is wrong.

There's a online lux to umol iirc it works it out to 950/1050 umol.

 

[Ca++]

There's a online lux to umol iirc it works it out to 950/1050 umol.

Interesting. Your light meter costs as much as a PPFD meter, and not only has LED settings, but coloured one's, such as amber. Which the PPFD meter doesn't. So I kinda believed the 70,000 reading. If it's just 1000ppfd, then that might be the furthest from the average meter, that I have seen. As an example, my meter says 30,000 at 900ppfd. My meter living the other side of average.

 

[Hiddenjems]

The spectrum makes a big difference.

“Both PPFD and Lux are units used to measure the intensity of light. Whereas Lux is universally used to measure and compare the brightness of visible light, PPFD is referring to the amount of light suitable for active photosynthesis of plants.”

 

[CocoNut 420]

Interesting. Your light meter costs as much as a PPFD meter, and not only has LED settings, but coloured one's, such as amber. Which the PPFD meter doesn't. So I kinda believed the 70,000 reading. If it's just 1000ppfd, then that might be the furthest from the average meter, that I have seen. As an example, my meter says 30,000 at 900ppfd. My meter living the other side of average.

Tbh i didn't know the different colours measurements were useful apparently lux meters aren't much use?
I've only used the basic auto function to get a figure to work from.

I looked at the website again, i can't remember which mix I selected to arrive at 1000± umol'
I've got straight 3k 4k and 3/5k mixes.

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

Using different mixes gives different results they're between 1120u and 1330 umol.

 

[Rocket Soul]

Tbh i didn't know the different colours measurements were useful apparently lux meters aren't much use?
I've only used the basic auto function to get a figure to work from.

I looked at the website again, i can't remember which mix I selected to arrive at 1000± umol'
I've got straight 3k 4k and 3/5k mixes.

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

Using different mixes gives different results they're between 1120u and 1330 umol.

Lux meters are biased towards green, they measure how intense the light is to the eyes, not the photons which is what the plant see. Green is the most visible color and white light is quite rich in green.

You can still use a lux meter for basic stuff in your grow like equal light over the cannopy; when it comes to over/under lit: this is something you just have to be able to see from your plants reactions. Even if you have a par meter dialing you in to exactly 800ppfd, if the plant cant handle it then it cant handle it.

 

[CocoNut 420]

this is something you just have to be able to see from your plants reactions. Even if you have a par meter dialing you in to exactly 800ppfd, if the plant can't handle it then it can't handle it.

This is also what I found, the figures are only a guide the fine tuning is by our eyes.

 

[Hiddenjems]

This is also what I found, the figures are only a guide the fine tuning is by our eyes.

I use a meter to set light height and position to light the canopy evenly. The plants tell me how much they can take.

It seems like my high yielding strains need less light for quality bud, and I can get more square feet per light with them.

One cut I have needs to be basically burnt up with light and nutes to be worth a damn.

 

[Crooked8]

I use a meter to set light height and position to light the canopy evenly. The plants tell me how much they can take.

It seems like my high yielding strains need less light for quality bud, and I can get more square feet per light with them.

One cut I have needs to be basically burnt up with light and nutes to be worth a damn.

I feel the frustration there. With an ever more challenging market to compete with we need variety in our space. Makes it difficult to give everything each strain needs. I currently see upward curling, downward curling, hunger and overfed plants in our lab all with some strains absolutely perfect and everything being fed the same with most parameters the same. Very hard to manage this.

 

[420PyRoS]

Man. What a thread.
I must say, @Prawn Connery I have had simular results as you regarding UVA over UVB.

I always always thought UVA was key. Tickles the surface of the leaf. I'll leave it at that

Anyways, I started my first grow with HPS, heat issues galore in my setup.

I switched to LED as a noob grower and grew like the pros. Never looked back, and still experimenting.

It's all dependant on your setup, needs and what can be handled.


I leave some pics here of my plants that I Trich out right from seedling with LEDs. Quite repeatable.

I used a cheap 100w chinese Blurple LED and a 200w spider farmer now. Both pushed out simular results.

I'm not commercial, and I don't sell or endorse anything. It all has a purpose and place.

 

[420PyRoS]

Man. What a thread.
I must say, @Prawn Connery I have had simular results as you regarding UVA over UVB.

I always always thought UVA was key. Tickles the surface of the leaf. I'll leave it at that

Anyways, I started my first grow with HPS, heat issues galore in my setup.

I switched to LED as a noob grower and grew like the pros. Never looked back, and still experimenting.

It's all dependant on your setup, needs and what can be handled.


I leave some pics here of my plants that I Trich out right from seedling with LEDs. Quite repeatable.

I used a cheap 100w chinese Blurple LED and a 200w spider farmer now. Both pushed out simular results.

I'm not commercial, and I don't sell or endorse anything. It all has a purpose and place.

Some last season seedlings.

 

[CocoNut 420]

Blueberry twist, vegged 28 days T5s @12-12

Start of wk 6 under led.

 

[revegeta666]

Blueberry twist, vegged 28 days T5s @12-12
View attachment 18954517
Start of wk 6 under led.

Let's go T5 team!!

 

[CocoNut 420]

Let's go T5 team!!

I love my t5s, they're great propagating lights for cooler climates and they're good for vegging.

I keep my perpetual grow going from 4x T5s.

 

[Prawn Connery]

got a question for you LED guys...I've got a photontek 600 in a 5'x5' tent...got the light on full blast and am a bit confused...seems the trichomes on this run aren't all that great...flowers look stellar but seem to have little trichs on them...is it possible I've got too much light in the tent, flowers are about 12" from the fixture...I've used HPS for decades and have never seen this...I've grown the same strain for ages and this is the first I've seen of this...

That's not too much light for that sized tent, assuming you are using all your available space to grow and you have the light high enough to deliver an adequately even canopy. Looking at the PAR map, that light has decent PPFD coverage over about half the 5x5 canopy at 40cm hang height, but I would probably be hanging it at around 50cm to reduce the amount of light in the middle from 900-1000 PPFD to around 800-900 PPFD to increase the light around the edges.

You can see how quickly the light drops off around the edges and corners.

SPAM TIME: Here is a typical 5x5 PAR map for two of our Longboards running at about the same combined wattage (~300W per fixture or ~600W total) at 60cm (2') above the canopy. You can see the peak PPFD numbers are very similar to your light, but there is a lot more light around the edges and corners.

When people tell me how great bar lights are, I simply point them to our PAR maps to show why bar lights don't, in fact, have better coverage than a couple of LED Longboards. It's hard for a lot of people to wrap their heads around, even when you show them the evidence, but that's why we do these things, to dismiss the "bro science" aspect of growing.

As for your lack of trichomes, I don't really know what to say. We are testing LED cannabis with THC percentages in the high 20s and in some cases close to 30%, so the science says THC levels are not lower under LED compared to HPS – assuming optimum grow conditions.

Here's one of my LED grows that shows visible trichs all over the fan leaves during early flower. However, I never grew this strain under HPS so I can't give you a direct comparison – I can only show you that it's possible to grow "trichy" weed under LED.

 

[Boo]

the last few runs I had nice trichs but when I moved the tent into the house the trichs stopped...same strains as my last few runs but these flowers are fully formed, hard, but dry...dunno prawn, I'm baffled because I have 7 plants in the tent, about 24" from the lights and no trichs anywhere in the tent...

 

[Prawn Connery]

So the last few runs when you had nice trichs, were they grown under the same light?

 

[Boo]

yessir, same lights and same feeding schedule...the only difference is that now that reside in my home vs. the air conditioned shop...it just doesn't make any sense...

 

[kro-magnon]

yessir, same lights and same feeding schedule...the only difference is that now that reside in my home vs. the air conditioned shop...it just doesn't make any sense...

Did you get some clones from other gardens recently? There is a virus who can make disappear the resin from any plant, the HLVP I think it's called but it can only contaminate your garden if you let it in.

 

[Crooked8]

Did you get some clones from other gardens recently? There is a virus who can make disappear the resin from any plant, the HLVP I think it's called but it can only contaminate your garden if you let it in.

I am wondering if its a viroid situation but seems too sudden and dramatic.