5x5 LED setup

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kaldzzz

Member
a mongo frog said:
I built the COB unit about 1.5 years ago and never used it till now. The reason why the QB's are in there is because i want to see what does what in case I decide to switch out some hps lamps. This is my first LED run. This room used to be 3 1k hps.
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Are you running them in series or parallel? Also, what drivers and heat sinks are you using? Much appreciated
 
K

kaldzzz

Member
a mongo frog said:
In series. And these
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Hey man, thanks for the reply.
At 1400mA, your running the cobs at less than half their rated current. According to the data sheet, at 1400mA, the cobs are running @roughly 34v. The driver in the picture has a range of 89-179V so 34v x 5cobs= 170v.
170x1.4= 238W. What happens when you dim all the way up? I assume the voltage will go up when you dim up and will provide max power of 250w?
Are you running 5 cobs per HLG-240H-C1400B? Sorry for lengthy post I’m just trying to find best configuration and be efficient. Also, are 15 cobs required if I’m only growing 4 plants in a 5x5 or can I go with like 12 COBs instead?
 
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a mongo frog

a mongo frog

Well-Known Member
kaldzzz said:
Are you running 5 cobs per HLG-240H-C1400B?
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Yes 5 cobs per driver. Lights cranked all the way up, have never dimmed down. My cob fixture gives about a 5x4 foot print, perfect for a 5x5 room. Im not an LED guy bro, I'm just fucking around. Millions more educated here then me. But ill tell you all i i know so far.
 
Aolelon

Aolelon

Well-Known Member
If it's a 1400mA driver that's all the current you're going to pull out of it. So there would be no dimming up for him, he could dim down to 700mA
 
Aolelon

Aolelon

Well-Known Member
If you got the A version of the driver you might be able to hit the full 250w as it allows just a little more juice from it
 
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K

kaldzzz

Member
Aolelon said:
If you got the A version of the driver you might be able to hit the full 250w as it allows just a little more juice from it
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Interrsting. So what is the added benefit of going up to a let’s say 2400mA vice 1400 driver aside from putting out more heat? Do you get much more photons etc or is 1400ma sufficient?
 
K

kaldzzz

Member
Aolelon said:
If it's a 1400mA driver that's all the current you're going to pull out of it. So there would be no dimming up for him, he could dim down to 700mA
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a mongo frog said:
Yes 5 cobs per driver. Lights cranked all the way up, have never dimmed down. My cob fixture gives about a 5x4 foot print, perfect for a 5x5 room. Im not an LED guy bro, I'm just fucking around. Millions more educated here then me. But ill tell you all i i know so far.
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Thanks bro you’ve been a great help!
 
Aolelon

Aolelon

Well-Known Member
Sorry my calculations were a little off above, I forgot to factor in voltage drop when not at 2400mA so
 
Aolelon

Aolelon

Well-Known Member
kaldzzz said:
Interrsting. So what is the added benefit of going up to a let’s say 2400mA vice 1400 driver aside from putting out more heat? Do you get much more photons etc or is 1400ma sufficient?
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The higher mA you go up the less lm/w you get, but at 2400mA you're going to be putting out more light than at 1400mA
Your efficacy is going to drop though the higher mA you go. At 1400mA you have 164lm/w at 2400mA you're down to 140lm/w so at 2400mA you'll be getting higher lumens obviously cause you're at a higher wattage, but it would be more efficient to just add another cob at 1400mA
 
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K

kaldzzz

Member
Aolelon said:
The higher mA you go up the less lm/w you get, but at 2400mA you're going to be putting out more light than at 1400mA
Your efficacy is going to drop though the higher mA you go. At 1400mA you have 164lm/w at 2400mA you're down to 140lm/w so at 2400mA you'll be getting higher lumens obviously cause you're at a higher wattage, but it would be more efficient to just add another cob at 1400mA
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So what do you recommend for my set up for 5x5 tent? I'm thinking 12-15 COBs but can't decide on type/number of drivers. Thx
 
Aolelon

Aolelon

Well-Known Member
I mean 15 is going to cover you well, but you could do 12 no problem, more points of light is never a bad thing. With 12 I would go with a bigger driver so you could dim it and if you wanted to crank it up.
 
Aolelon

Aolelon

Well-Known Member
TintEastwood said:
1750 is available. Good happy medium, ability to run them harder at 1750 during late flower.
HLG-240H-C1750B. 2400....too much (more) heat and stress on components.

http://ledgardener.com/cob-led-driver-selection-tool/
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That's what I would go with as well. 12 with the 240h-c1750a x 3 4 on each rail.
Timber has the same setup for a 5x5. While they run theirs harder than 1750mA, up to 900w, I think that would be ok. They are using the 320h-c2100
 
K

kaldzzz

Member
Interesting. Checked rapidled for 5x5 setup and they’re using 320-2100 with 12 cobs for a 5x5 setups. I think I narrowed my search to either 320/2100 and 240/1750. Thanks all for your time
 
Aolelon

Aolelon

Well-Known Member
Timber is also using 12 at with the 320-2100. That will give you 900w, and you have the ability to dim them down if needed.
 
diyled

diyled

Well-Known Member
Driving cree cxb3950 hard? thats an expensive, inefficient rig.

Luminus cxm22 @1400ma is the best option or vero 29c @1400ma.
 
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