Mars 300 to Cree COB DIY hack. advice please.

ThumbSmasher

ThumbSmasher

Member
I'm thinking about converting 2 mars hydro 300's to Cree Cob's for a 2'x'3 closet.

Each mars has 2 drivers, both capable of driving 86 volts. 1 of the drivers operates the fan.

For one Driver (without the fan) I'm thinking: 2 Cree cbx3590 3500k (36volts each, 72volts total)

Other driver (with the fan): 1 Cree cbx3590 3500K, 4 philips luxeon ES deep red 3watt, and 4 philips luxeon ES royal blue 3 watt (total 60v .. should be plenty of room to operate fan as well)

thoughts? suggestions? something you would do differently?

Here are the drivers.
 

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ThumbSmasher

ThumbSmasher

Member
Well i have 2 drivers.. both are 86V max. .. I would like to put 2 cbx3590's on each driver, but im afraid if i put 2 cbx3590's on the same driver that runs the fan i will overload that driver .. so i figured i would just use 2 on 1 driver, and 1 on the other, and then add some supplemental lighting.

i did see a thread somewhere where Supra (i believe that's his name.. he seemed pretty reputable) threw some of those deep red's and royal blue's in the mix

and like i mentioned, it's 2 mars 300's in a 2x3' area. so if i modify them both i will have 6 cbx3590's in that little area with a bunch of smaller supplemental lights. i feel like it will be more than enough, but im more than willing to listen to other people's input.
 
HideousPenguinBoy

HideousPenguinBoy

Well-Known Member
ThumbSmasher said:
Well i have 2 drivers.. both are 86V max. .. I would like to put 2 cbx3590's on each driver, but im afraid if i put 2 cbx3590's on the same driver that runs the fan i will overload that driver .. so i figured i would just use 2 on 1 driver, and 1 on the other, and then add some supplemental lighting.
Click to expand...
Running at 640mA, I believe the forward voltage is like 34ishV. So not enough room for another CXB, but definitely enough for other stuff. What's your fan need? And in general, the closer you are to the full voltage the more efficiently it runs, so I say push that envelope.

And yeah, SupraSPL is super legit. I was just excited to read the thread. (;
 
ThumbSmasher

ThumbSmasher

Member
Good question on the fan. I'm not sure to be honest. I did pop the cover off of the light fixture and I saw the top of the fan and there was no specifications for it on top but maybe I can pull the whole thing out and there will be some specifications on the underside
 
Jon E. Doe

Jon E. Doe

Well-Known Member
Really interested in trying this. Ive got a Viparspectra 300 that I'm gonna keep intact, but I can get another for dirt cheap to try this with. The little 300 does ok in my little tent for veg, but I don't think it's gonna have the goods to push these two plants through flower.
 
ThumbSmasher

ThumbSmasher

Member
I got a vipar 450 I'll probably convert later.

I found out my fan on the Mars draws 1.68 watts give or take 10%. I could just go all cxb"s 3500k with no reds or blues.. haven't decided yet.. 8 cxb's with in a 3x2' would be pretty heavy I think
 
HideousPenguinBoy

HideousPenguinBoy

Well-Known Member
ThumbSmasher said:
I got a vipar 450 I'll probably convert later.

I found out my fan on the Mars draws 1.68 watts give or take 10%. I could just go all cxb"s 3500k with no reds or blues.. haven't decided yet.. 8 cxb's with in a 3x2' would be pretty heavy I think
Click to expand...
CXB3590CD36V3500K 8 COBS @0.7A
6 SQ.FT. CANOPY 95% EFFICIENT DRIVER
Total power watts at the wall: 192.63
Cobs power watts: 183
Total voltage forward: 262
Total lumens: 37952
Total PAR watts assuming 10% loss: 105
Total PPF: 488.25
PPFD based on canopy area: 875.91
PAR watts per sq.ft.: 17.5
Cob efficiency: 64.01%
Power watts per sq.ft.: 30.5
Voltage forward per cob: 32.72
Lumens per watt: 207.39

You are at 640mA, but it's pretty close to this info. (I'm using the DIYCOBLEDCalculator.jar ) You'd have to have it high up/dimmed for veg, but it's great for flower. You are right around the spot where increasing it more than that would require CO2. (1100PPFD, I believe)
 
Jon E. Doe

Jon E. Doe

Well-Known Member
You are at 640mA, but it's pretty close to this info. (I'm using the DIYCOBLEDCalculator.jar ) You'd have to have it high up/dimmed for veg, but it's great for flower. You are right around the spot where increasing it more than that would require CO2. (1100PPFD, I believe)
Click to expand...
Aka - :fire:BEASTMODE:fire:
 
ThumbSmasher

ThumbSmasher

Member
HideousPenguinBoy said:
CXB3590CD36V3500K 8 COBS @0.7A
6 SQ.FT. CANOPY 95% EFFICIENT DRIVER
Total power watts at the wall: 192.63
Cobs power watts: 183
Total voltage forward: 262
Total lumens: 37952
Total PAR watts assuming 10% loss: 105
Total PPF: 488.25
PPFD based on canopy area: 875.91
PAR watts per sq.ft.: 17.5
Cob efficiency: 64.01%
Power watts per sq.ft.: 30.5
Voltage forward per cob: 32.72
Lumens per watt: 207.39

You are at 640mA, but it's pretty close to this info. (I'm using the DIYCOBLEDCalculator.jar ) You'd have to have it high up/dimmed for veg, but it's great for flower. You are right around the spot where increasing it more than that would require CO2. (1100PPFD, I believe)
Click to expand...

i think i <3 u.

great info bro haha
 
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