Diy cob led help please!

Corvette kidd

Active Member
Ive been reading up on it and its pushing 36 volts to each cob and the total amps (5.2amps) will be divided among the cob lights. The only problem they say to look out for is thermal runaway. Why do you say it is a fluke?
I say its a fluke because every time ive ran in parallel the leds fried in a few minutes. The drivers have a hard time keeping a constant voltage supplied to each led (somtimes more v sometimes less v) this inevitably causes overloading/underliading issues in my experience. If you think it will work then just go for it my dude, experimentation is key to success and learning bro
 

VegasWinner

Well-Known Member
This is how i wired up all my other lights. This is just for testing tho
I use drivers like those to drive individual cob's for l8ight usage at lower watts, like 50w or less. to run a fixture I use 4 CBV35990's 36v and a MW HLG-185H-C700B/C1400B pick either with great results and power control and no parallel connections. The MW 185H series are all 200W drivers, meaning you get 200w when you connect four 36v cob's to it. PLC has a 250w driver for five cobs at 36v. Both are connecting all cobs in series which is safest. You can turn your 8 cob 36v into 400w real easy with two hlg-185h-c1400 drivers. maybe resell your drivers on ebay for break even. peace
 
So did what did you decide to do broskie?
Im just going to test the drivers and cobs out in parallel and go by trial and error. I definitely want to do series but to return the drivers and get the other ones would take about 3 weeks and my plants are too big to wait 3 weeks plus i have plants right behind them to take their place. Theres another guy on rollitup that says hes running in parallel and doesnt have issues and been running them for years so i guess im about to find out. Im going to run 4 cobs on each driver. Each cob will be running around 50 watts so theres plenty of wiggle room if one burns out snd the power is distributed to the other 3 cobs. I have plenty of heat distribution too. 3 cobs on 6"x40" heatsinks with fans blowing on it. I will let you guys know how it works out for me k. And thanks for your advice guys. I appreciate it a bunch.
 

Corvette kidd

Active Member
Dang bro 3 cobs on a 40inch heatsink? Thats like overkill times 10 haha, forsure you wont be needing fans on it. I run 3 vero29's at 66.7 watts on a heatsink that is 4"x24" and even that is way overkill, i dont even run fans on my fixtures and they stay at a constant 68 degrees. i use them as garage lights as well as grow lights haha. you could realistically run your 3 cobs on a 12 inch long heatsink with no problems. Just keep in touch man and let us know how everything turns out
 

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Corvette kidd

Active Member
How big is your grow space if you dont mind me asking? And how many of those fixtures are you going to build to cover the grow space?
 
I have a 10x15 space and i am building 4 of them to cover the whole area. Ill have a lil path down the center to get to all the plants. I still have to finish building all the lights and clean up and then ill lay the white plastic on the concrete floor. As you can tell i turned a single car garage into a grow room lol. Each light fixture is 6ft by 40 inches. Each cob is spaced 15 inches apart on each heatsink and 14 inches from heatsink one heatsink to the next. I figure thats a lil over 1 sq ft per cob.
 

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Corvette kidd

Active Member
I have a 10x15 space and i am building 4 of them to cover the whole area. Ill have a lil path down the center to get to all the plants. I still have to finish building all the lights and clean up and then ill lay the white plastic on the concrete floor. As you can tell i turned a single car garage into a grow room lol. Each light fixture is 6ft by 40 inches. Each cob is spaced 15 inches apart on each heatsink and 14 inches from heatsink one heatsink to the next. I figure thats a lil over 1 sq ft per cob.
Looks legit my dude. you may want to consider hanging each heatsink on it own, it gives you a little more wiggle room to spread light to different parts of your canopy. Looks like you are going to pull some serious product from that space tho
 

Corvette kidd

Active Member
Im digging that bright red Corvette. Love those cars. Ill have one eventually lol
Thanks haha, dude they are a dime a dozen right now. Those two vettes are the first cars ive ever bought, and the only vehicle i own hahaha. They are both 2003 c5 z06's, one is supercharged and built for autocross, the other is my daily. You can buy these beasts for less than $20,000 now bro, cheaper than buying a new honda haha.
 
Thanks haha, dude they are a dime a dozen right now. Those two vettes are the first cars ive ever bought, and the only vehicle i own hahaha. They are both 2003 c5 z06's, one is supercharged and built for autocross, the other is my daily. You can buy these beasts for less than $20,000 now bro, cheaper than buying a new honda haha.
Man i havent been car shopping for a while. 20gs is definitely doable. I wanted to trade my 2010 cts in for a newer model. I definitely like the all wheel drive in winter time here in colorado. I was thinking about hanging the heatsinks separate but im pretty good at keeping the canopy fairly even. Im still learning the tricks of the trade so ill see how it goes with this run. I take it that you hang yours individually?
 

FullCarve

Well-Known Member
I use drivers like those to drive individual cob's for l8ight usage at lower watts, like 50w or less. to run a fixture I use 4 CBV35990's 36v and a MW HLG-185H-C700B/C1400B pick either with great results and power control and no parallel connections. The MW 185H series are all 200W drivers, meaning you get 200w when you connect four 36v cob's to it. PLC has a 250w driver for five cobs at 36v. Both are connecting all cobs in series which is safest. You can turn your 8 cob 36v into 400w real easy with two hlg-185h-c1400 drivers. maybe resell your drivers on ebay for break even. peace

A noob question:

if I dim down to 700mA from 1400mA, it's still 200W then can I put 8 cobs to one HLG-185H-C1400?
 

Corvette kidd

Active Member
A noob question:

if I dim down to 700mA from 1400mA, it's still 200W then can I put 8 cobs to one HLG-185H-C1400?
You can only do this if the drivers voltage output equals the combined voltages of all 8 leds. So lets say your led chips need 34v to operate. if you want to run "8" of these 34v 100w led chips from a single driver you first need to multiply (34x8=272v) to get your drivers total needed voltage output which is 272v. So to answer your question, no you probably cant run 8 of the leds you are thinking of with this driver
 

Shugglet

Well-Known Member
A noob question:

if I dim down to 700mA from 1400mA, it's still 200W then can I put 8 cobs to one HLG-185H-C1400?
When you dim it down it is no longer 200w. amps x volts = watts. In other words itll only be putting out ~100w at 700mA.

The 250watt or 320watt version of the same driver might fit those needs though.
 

VegasWinner

Well-Known Member
Looks legit my dude. you may want to consider hanging each heatsink on it own, it gives you a little more wiggle room to spread light to different parts of your canopy. Looks like you are going to pull some serious product from that space tho
I agree. Make a rail hung from ceiling and put angles on the ends to hang on the rail. Check out GG Garden he has same arrangement. Peace
 
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