sleepless
Well-Known Member
I run my 1825s at 70 watts tines 4 in a 3x3
Cree DIY COB LED? Why do people use white lights?
Tomula
Well-Known Member
Yes, you see, I cannot post links to another forums, dunno why in the time of open Internet. But Google this: top-bin-cob-comparison-2.897765/page-8
You should find it. Cheers!
Tomula
Well-Known Member
Hello, I did find the Citizens 1825 in 80CRI each for about 37 + 30$ postage after import taxes to my country, on Alibaba. I think this is a great price considering it more bang for your buck than the CREE. I wish everyone happy growing! 
Hey folks, I have a few questions if you dont mind. I have about 25 led drivers sitting around, they are universal input, output is 55 -105 V and 550 MA, a few are 600 MA. I want to run to 36v cobs at 550- 600 MA. The cobs are maxed out at 1080 MA at 58.8 W. So I would be running about 30-32 W each. They produce 147 Lumens per watt at 540 MA. Does this sound like they will work. I will have 4 or 6 per case, what spec. would you go with, strictly for flower, 2700, 3000, or 3500, or a combination, like 4- 3500 and 2- 2700. One last question, these do need to be wired in a series, correct, Power supply + to 1st cob +, 1st cob - to 2nd cob +, 2nd cob - to - power supply. I appreciate any and all help, I had posted under grow lighting and no one responded, so here I am. Thank you
growmau5
New Member
if all the drivers have 105v available on the dc out, don't you think one of the many 50v cobs would be a better choice than 36v? most led drivers run most efficiently when their dc voltage is 90-95% utilized. options:
-vero gen7 'B' version: BXRC-35E10K0-B-7X
-citizen CLU048-1818
-citizen CLU058-1825
-vero gen7 'B' version: BXRC-35E10K0-B-7X
-citizen CLU048-1818
-citizen CLU058-1825
Will those cobs run ok on 550- 600MA, since nominal MA on like the vero is around 2000MA. Other than you recommend a different chip does everything else sound correct, and I have already checked the vero chip, that is an option . What I am doing is I have 6 of the old style mars 300 and I want to convert them to cob, the CLU -38 Gen. 5 Is what I was going to use, But i am still learning, so any and all advice is appreciated , Thanks for your time growmau5.
growmau5
New Member
Will those cobs run ok on 550- 600MA, since nominal MA on like the vero is around 2000MA. Other than you recommend a different chip does everything else sound correct, and I have already checked the vero chip, that is an option . What I am doing is I have 6 of the old style mars 300 and I want to convert them to cob, the CLU -38 Gen. 5 Is what I was going to use, But i am still learning, so any and all advice is appreciated , Thanks for your time growmau5.
On the lower drive current drivers (under 1000mA) I really like the 50v cobs because you get a little more bang for the buck:
36v x .550a = ~20watts
50v x .550a = ~27.5 watts due to Ohm's Law/Watt's law whateva.
If it were me, on a budget, I would go Citizen CLU048-1818 3000k or 3500k 80cri. or any mix you find suits you.
suppliers: CDIweb, COBkits.com, Timber grow lights.
with any of these suppliers, I would inquire that they are carrying the GEN6.
Cheers
I have 6x 55-75v 600ma drivers, would you then recommend me to use 6x 72v cobs over 12x 36v cobs (1x40w over 2x20w) ??? It is for a 2x4 I plant to have 3 autos in there
... I guess the grow room will get quite busy with 12 cobs, heatsinks and all 
I like Cheese
Well-Known Member
These guys rock !
I am waiting for and trying to find all the parts (bit of a pain) for a 400w cob enough to cover a 1 meter square tent. I am going to use 8 cree cxb3590's. I am using a build that growmau5 have put out on youtube.
You folks really should check out their youtube channel, it has all you need to know and more. Thanks for the inspiration growmau5.
Similar threads
