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I'm using the same set-up for the 1st time...cfl's..I have a problem with 24 hr. lighting. I also just cut a vent hole in the top of box and a vent in the bottom..Heat rises, and as it does and vents out the top it pulls cooler air from the bottom...It works fine for 2 cfls. I've got no heat problems at all. If you use more lights or stronger lights, it won't work..
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