LED Ahoy!

[rattlingdags]

Thats really interesting to read as I've had problems in the past with my plants burning when they start to get close to my led's - usually at 15cm away. Up until that height the plants are brilliant, grew like nothing else. At first I was thinking that you can't burn plants with led's and assumed it was me overfeeding, but no I came to realise that it was the lights being too close and that I couldn't in fact have them as close as what I'd read.
What you've written confirms I did the right thing by backing them off. Thanks for that

[khyberkitsune]

Thats really interesting to read as I've had problems in the past with my plants burning when they start to get close to my led's - usually at 15cm away. Up until that height the plants are brilliant, grew like nothing else. At first I was thinking that you can't burn plants with led's and assumed it was me overfeeding, but no I came to realise that it was the lights being too close and that I couldn't in fact have them as close as what I'd read.
What you've written confirms I did the right thing by backing them off. Thanks for that

The common misconceptionis that heat is hurting the plants. That's only part of the equation. WHat happens is chlorophyll breaks down and is rebuilt constantly. However, there's only so much light it can take before it begins breaking down faster than it can regenerate. This causes the bleaching, and heat is only a compounding issue once oyu hit very high levels of photon flux.

[rattlingdags]

Ah that explains the first symptom that I noticed - how the leaves actually become bleached, they also became almost like fine parchment in texture.

[khyberkitsune]

I have noticed something. It seems the plants can tolerate the light much more in veg. I didn't really get bleaching issues until flowering in all the times I encountered bleaching.

I'm certain this is strain-dependent, however I could be wrong. I had a similar issue with the old White Widow I grew under HPS/T5HO

[khyberkitsune]

Had a harvest of a different sort. Plenty of weight here from a measly 200w LED.

Now to go clean the NFT system out and restart it back in the old 4 channel config, so I can have that free bench space for other stuff.

[rattlingdags]

Ohh yummm they look wonderful. What a great haul just from 200W That's got me planning to sneak in some greens around the girls for over the winter... The climate here for most of the year is so awful for outside vegetables but I really love to grow my own. They always seem to taste so much nicer.

[Egzoset]

Hello Khyberkitsune,

I've started reading about LED lamps for cannabis growing a few days ago and i notice there are at least six bands which play some significant role in the plant's development:

310 nm (UVB)
455 nm Blue (chlorophyll-A)
475 nm Blue (chlorophyll-B)
625 nm Red (chlorophyll-B)
665 nm Red (chlorophyll-A)
735 nm (Near Infra-Red)

Of course i suppose those numbers are approximative. Power levels and power level ratios appear to be equally important, depending on the plant's development phase.

To your knowledge, can you tell me please if there's a manufacturer who's trying to build a lamp with that many bands where colours can be controlled individually to account for vegetal cycles such as vegging, flowering, etc.?

[khyberkitsune]

Hello Khyberkitsune,

I've started reading about LED lamps for cannabis growing a few days ago and i notice there are at least six bands which play some significant role in the plant's development:

310 nm (UVB)
455 nm Blue (chlorophyll-A)
475 nm Blue (chlorophyll-B)
625 nm Red (chlorophyll-B)
665 nm Red (chlorophyll-A)
735 nm (Near Infra-Red)

Of course i suppose those numbers are approximative. Power levels and power level ratios appear to be equally important, depending on the plant's development phase.

To your knowledge, can you tell me please if there's a manufacturer who's trying to build a lamp with that many bands where colours can be controlled individually to account for vegetal cycles such as vegging, flowering, etc.?

No, AFAIK there are no proper scientifically-controlled/tested light studies besides the ones conducted by John Lydon. I'm the only one that is following the actual research, everyone else is advertising multiple bands (11+) of light as if it were something to work with, when in reality, it isn't. Thank you, wikipedia readers, for fudging the real movement.

[khyberkitsune]

Alrighty! Apologies for being incommunicado, I've been busy moving into my new place and preparing for my next grow, since I'm no longer contractually bound to not cultivate it.

So prepare for a grow update very soon!

[LetsSeeYa]

Alrighty! Apologies for being incommunicado, I've been busy moving into my new place and preparing for my next grow, since I'm no longer contractually bound to not cultivate it.

So prepare for a grow update very soon!

Hey khyber my fellow LED grow brotha:thumbsup:, looks like i made it here just in time for your grow show. Iv been reading a bunch and trying to attempt a scrog:wtf:. Sad thing is i cant think of a way to make a screen, but whats worse is im so broke i cant buy anything. But im working on it.

I also hope ya dont mind i put this pic up. I just have something that looks like lack of N, but was reading about off gassing and was wondering if you have ever seen it. My tent isnt the best as far as ''name brand'' so im not sure just what im working with here.

Iv missed the site a lot and would like to start a thread here, after all this site is where i got all the help and information to get to where im at now.

Sure glad ya have this thread still going, i get a lot from it for sure. Like as of now my lights are about two feet away, but your saying i can get threm closer? Great:thumbsup:. Maybe you can take a look at the pic and tell me what you think. You know what lights im burning and got the experience to give me great info.

So any help, i sure would appricate it like always bro:jointsmile:



LSY