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sureshot138

Well-Known Member
@CobKits
I have a hlg-120h-48a can I run 2 gen5 1818's and 2 cxm22 gen3 off that driver?
Or is the voltage to different between the chips?
not recommended to mix gen 5 and gen6 chips or Citis with luminus, etc. Despite the fact that they are all “50V chips”, slight voltage differences may cause unpredictable results
 

CobKits

Well-Known Member
not recommended to mix gen 5 and gen6 chips or Citis with luminus, etc. Despite the fact that they are all “50V chips”, slight voltage differences may cause unpredictable results
im not saying it wont work, but as it says, results may be unpredictable. remember slight variations in voltage can cause massive differences in current. fortunately the -48A is adjustable to reduce voltage to 53.5V or less, so both of those chiips would be safe but you could have a situation where an 1818 is running at 1.7A, and a CXM22 is only drawing 1.0A. depends on what you want to do but again, results will vary
 

mefunky

Well-Known Member
im not saying it wont work, but as it says, results may be unpredictable. remember slight variations in voltage can cause massive differences in current. fortunately the -48A is adjustable to reduce voltage to 53.5V or less, so both of those chiips would be safe but you could have a situation where an 1818 is running at 1.7A, and a CXM22 is only drawing 1.0A. depends on what you want to do but again, results will vary
That's kind of what I was thinking, figured I would ask to check. thanks for the help folks.
 

cocoleveo7686

Well-Known Member
What would you guys recommend for a 200w diy cobb light. I have looked at the different leds but have a hard time understanding the voltage that goes with it. If i knew what to buy i could put it together
 

KonopCh

Well-Known Member
im not sure i understand, in a properly illuminated garden the entire plant is uniformly illuminated. some people like to defoliate, thats a different discussion and an oft-debated technique. check out @Greengenes707 's latest grow on youtube for some expert canopy maintenance utilizing light defoliation
Autos have more dominant central cola and it's 25-35cm bigger than other colas. So I get let's say 800 umoles on central cola, and only 400 umoles on lowers. But lowers have bigger surface, so if I adjust lights and get 800 umoles on lowers... so main cola isn't direct under COBs and it gets let's say 450 umoles.
 

pop22

Well-Known Member
Not an accurate statement about auto in general. Autos are like photos in that Indica dominant strains will have a large central cola, and Sativa doms will not.

Autos have more dominant central cola and it's 25-35cm bigger than other colas. So I get let's say 800 umoles on central cola, and only 400 umoles on lowers. But lowers have bigger surface, so if I adjust lights and get 800 umoles on lowers... so main cola isn't direct under COBs and it gets let's say 450 umoles.
 

KonopCh

Well-Known Member
Not an accurate statement about auto in general. Autos are like photos in that Indica dominant strains will have a large central cola, and Sativa doms will not.
Yea okay, my enviroment then.
And before anyone ask "why not train them to have even canopy"... please answer to my question as it is.
 

pop22

Well-Known Member
If using more than one cob, and they were hung individually, I'd position them so that the light footprints touched but did not overlap at the main cola. its about as good as you could get it without side lighting, etc. In a reflective environment, placement is less important IMO, as the lower part of the plant will get light thats reflected from many angles, that won't show up when using a meter.

Just my 2 cents...lol

Yea okay, my enviroment then.
And before anyone ask "why not train them to have even canopy"... please answer to my question as it is.
 

pop22

Well-Known Member
his question and my reply are relevant as the question was about the lighting of the canopy. My reply affects further, more specific information.

but this is lighting forum how about taking your "autos" there..please

any "strain talk "should not be here..it just clutters things

and leds here..
 

Ebergen

New Member
4x50 W is the go-to and there are a few variations on that, but that basic design is ~$250 or so
I'd have a 6x3 space with two 400w hps lights. It worked in the winter, but it's only spring and just once light is already pushing it heat-wise. I'm thinking cob leds should be an improvement. I could assemble the lights with the parts, but I'm having trouble finding the time to research everything.

I'm tempted to buy the $100 400w 2 cob led light on amazon, but I'm sure that's subpar at best. I've heard of people swapping out the cob lights for better ones, maybe that's worth looking into.

Could you recommend a parts list for a 3x3 light? I'd just double it. A couple other sites sell kits, but you and this thread seem up to date with the newest tech. I like the sound of citizen - more bang for the buck.

Also, I've heard 2900k and 6500k are ideal for growing, why is 5000k popular with the cob guys?
 

CobKits

Well-Known Member
I'm tempted to buy the $100 400w 2 cob led light on amazon, but I'm sure that's subpar at best. I've heard of people swapping out the cob lights for better ones, maybe that's worth looking into.
little incentive to go into those lights with the plan to tear them apart, most people doing that are just making lemonade at that point

3 cobs at 75W each do a basic 3x3 well and will outyield a 400 hps with 25% less heat

i have assembled light engines which is a chip mounted to a heatsink and wired. thats a good start for somebody new

4 of those and a driver and some wire connectors and youre in business.i need to sort out inventory, my buddy was assembling them and we went crazy with options

5000k is a veg light mostly.

3000k and 3500k are most popular for flowering. 3500k being the more universal of the bunch

3000k 90 cri for flowering only if youve got a dedicated veg rig or have some indoes you dont mind stretching a bit in early flower

best to email me at sales at cobkits.com and ill help with a parts list.
 
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