DIY LED Spacing

[Bradger]

Hi, All
I have a 4x4 tent.
6x CXB3590 Cree COBs (48watt per sf )
I plan on adding four more COBs when the budget allows bringing it up to 81watts per sf.

I'm building the substrate, and questioning the placement of the LEDs for good coverage at 6 COBs with considerations for the additional four being added later. I'd love to hear opinions on a lighting footprint/configurations.

Thanks in advance

 

[shimbob]

... (48watt per sf )
... bringing it up to 81watts per sf.

Can you show us the math behind these numbers? They are unusual.

 

[Bradger]

Ok, I know it's not the efficiency standard...
Each COB 3.6a x 36v = 129watts per (not as efficient as 1.4a but it works)
Assuming I used the whole 4x4 spsce.

I will be expanding the lighting when I can, which is why I didn't want to buy any of the Amazon specials and be pinned down.

Should I run them at 1.4a and cluster them around one or two plants, or what can I get away with? I don't need to fill the full 4x4 if I can't yet.

 

[Renfro]

I plan on adding four more COBs when the budget allows bringing it up to 81watts per sf.

81 watts per sqft is way overkill. 35 - 40 watts per sqft with quality LED is where you wanna be.

 

[Boatguy]

Ok, I know it's not the efficiency standard...
Each COB 3.6a x 36v = 129watts per (not as efficient as 1.4a but it works)
Assuming I used the whole 4x4 spsce.

I will be expanding the lighting when I can, which is why I didn't want to buy any of the Amazon specials and be pinned down.

Should I run them at 1.4a and cluster them around one or two plants, or what can I get away with? I don't need to fill the full 4x4 if I can't yet.

To run them like that they will need to be actively cooled.
If you want to run em at high amperage like that, the cmt series are meant to be more efficient at higher amperage.