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The cool white would work well for vegging wouldn't it?
I spotted this today and it got me thinking, I could easily ramp it up to say, 300watts, for about $150. It's passive cooled so there is no noise,...
There is a lot of heat coming off 600w - I think its important that you check: a) is it electrical burning smell - then you need to seriously...
I'd be interested in seeing the same maths with cheaper LED's - can you do the maths with: 1: Chinese LED panels (with 3w diodes) 2: Something...
You've done a very neat job of that grow light - props.
I'm not quite sure what the purpose would be of adding a CFL if you have two UFO's - although that said, more watts = more growth.