Cooling tank and MH bulb

[robbyville]

Well I'm not too sure about the temps of the bulbs. What I can tell you is that prior to building my canopy I asked asimilar question on RC. I was told by pretty much everyone that the best thing to do was blow air below the bulbs. That the bulbs would be fine but you really want to cool the air below to control heat in the aquarium. I mounted my fans slightly lower that center of the side panel and I have kept my tank at 78deg even throughout the hot summer.

I guess the question comes back to you...Are you asking about this to cool the aquarium or to optimise the life of your bulbs?

Best,

Rob