Introducing CobKits.com - specializing in DIY and Citizen COBs
sureshot138
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
CobKits
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
CobKits
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
mefunky
Well-Known Member
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
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.
KonopCh
Well-Known Member
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
Just my 2 cents...lol
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.
cocoleveo7686
Well-Known Member
What do you recommend for equipment? Would this be sufficient for a 4x2 grow tent?
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
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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Chronikool
Well-Known Member
2 x 2 240w 1818 Citizen tent...day 42