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Yeah, it depends on the type of light and the strength of the light as well. Some LED's can be placed as far as +3-4 feet from the surface. Some halides farther, some closer. It really does all depend on the type of light and its intensity.
I made a canapy n I'm puting. Two mh 400 Watt. 22 inches from the glass top and I'm outing a box fan on top for ample. Air flow what you guys think? ?!