Hanging them up will do the trick. I do that for all my high intensity lighting.Chris Pyle said:I know they get hot, ballast and bulb, but what about hanging them up outside of the tank about a foot or two above your tanks, if you have glass ceilings and you have a fan directly blowing on the bulb, it seems like it would be cool enough to use, even for just a couple weeks-a month.
Of course I am not talking about a 400 watt bulb, but maybe a 70-150 would do the trick? I think I might try it just to see how the tanks respond.