New to LEDs

Olive Drab Green

Well-Known Member
Yeah I just figured I'd explore the cob just a little more before I commit tomorrow and buy the HLG 135
Alright, let me get some stuff together. How about

-2x Vero29C, 3500k,80 or 90 CRI
-MeanWell HLG-185H-C1400B Driver
-A heat sink CobKits or someone else might recommend
-COB holder
-Thermal paste
-Build your own frame from extrusions
 

KlosetKush

Active Member
Alright, let me get some stuff together. How about

-2x Vero29C, 3500k,80 or 90 CRI
-MeanWell HLG-185H-C1400B Driver
-A heat sink CobKits or someone else might recommend
-COB holder
-Thermal paste
-Build your own frame from extrusions
HOT 135 seems like a better route for me right now as this is only my second go around. I'l consider a cob for my 4x4x6 grow cab I'm gonna make
 

KlosetKush

Active Member
Yeah, just roll with that, bro. Then, you can expand and add COBs later. Honestly, I am probably going to do exactly that. Get the HLG135 for two of my TastyLEDs to go on either side of.
Do cobs produce more heat than And? I' going for the lowest amount of heat possible for box
 

Olive Drab Green

Well-Known Member
Do cobs produce more heat than And? I' going for the lowest amount of heat possible for box
Probably a tiny amount, but it’s completely negligible. Like, nothing that would negatively impact your plant. I can put my hand on the heat sink and my plants have been within 1-2” of the light due to lack of vertical space with no burn.
 

Olive Drab Green

Well-Known Member
Remember, HIDs use incandescence (heating an element) to create light. COBs, QBs, and LEDs in general use electroluminescence (current arcing over a phosphor chip to create light.)
 

KlosetKush

Active Member
Remember, HIDs use incandescence (heating an element) to create light. COBs, QBs, and LEDs in general use electroluminescence (current arcing over a phosphor chip to create light.)
So potentially what you're saying is that with the 135 HLG I could run out of vert space and it wouldn't kill my plant of they touched the light or came 1-2"?
 

HydoDan

Well-Known Member
If you let it get that close it will bleach the color out of it. If it touches it will burn. Cobs are even hotter and need more distance.. You need to train plants to grow short and wide... Mainlining, lst, super cropping or scrog...
Research...
 

KlosetKush

Active Member
Im
If you let it get that close it will bleach the color out of it. If it touches it will burn. Cobs are even hotter and need more distance.. You need to train plants to grow short and wide... Mainlining, lst, super cropping or scrog...
Research...
I'm aware of the training methods and have started to practice them. But my issue was to seer how close I. Like get my QB to my plants without harm to figure out my absolute lowest I could put it. But I guess I'll have to experiment with my light on that one
 

NanoGadget

Well-Known Member
If at all possible I'd try to keep it at least 12 inches from the top of the plant. Two reasons for this.. If you look at the ppfd charts I've included from12 2x2.png 18 2x2.png the HLG website you will notice that at 12 inches the numbers in the center are higher than you probably need. This means an increased chance of bleaching. The other thing you'll notice is that if you get closer than 12 inches from the canopy the ppfd numbers around the edges of the grow space start to fall off noticeably because the light is too close to spread out before reaching the canopy. Is it safe for the plants to get closer than 12 inches? More than likely. But with proper training there is no reason you should have to find out. Hope this helps.
 

KlosetKush

Active Member
If at all possible I'd try to keep it at least 12 inches from the top of the plant. Two reasons for this.. If you look at the ppfd charts I've included fromView attachment 4078589 View attachment 4078590 the HLG website you will notice that at 12 inches the numbers in the center are higher than you probably need. This means an increased chance of bleaching. The other thing you'll notice is that if you get closer than 12 inches from the canopy the ppfd numbers around the edges of the grow space start to fall off noticeably because the light is too close to spread out before reaching the canopy. Is it safe for the plants to get closer than 12 inches? More than likely. But with proper training there is no reason you should have to find out. Hope this helps.

Clears things up 100%. Thank you sir!
 

KlosetKush

Active Member
If at all possible I'd try to keep it at least 12 inches from the top of the plant. Two reasons for this.. If you look at the ppfd charts I've included fromView attachment 4078589 View attachment 4078590 the HLG website you will notice that at 12 inches the numbers in the center are higher than you probably need. This means an increased chance of bleaching. The other thing you'll notice is that if you get closer than 12 inches from the canopy the ppfd numbers around the edges of the grow space start to fall off noticeably because the light is too close to spread out before reaching the canopy. Is it safe for the plants to get closer than 12 inches? More than likely. But with proper training there is no reason you should have to find out. Hope this helps.

And for the ppfd numbers correct me if I'm wrong.

Veg 300-700ish
Flower 500-1300ish
 

Olive Drab Green

Well-Known Member
And for the ppfd numbers correct me if I'm wrong.

Veg 300-700ish
Flower 500-1300ish
No, definitely not that low. Like, those lower numbers will kind of work, but they will not produce optimally. 600-800 in Veg, maybe as low as 500, but otherwise, 900-1200 in flower. I wouldn’t go lower.
 
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