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so you're running 3 metal halides inside a canopy that is completely sealed off??? Thats a very bad idea imo and i'm sure you're trying to fix it due to the very high heat problems its causing? Also having the top completely covered does not allow for gas exchange, so once you put on the vents (and i strongly suggest doing more than just one of those...the one wont be enough....and also put in a couple tiny little fans blowing under the lights but not on them)....but anywho, once you get the vents on your pH will likely rise a bit if you do not have a sump right now that is.
like tech said, if the lights are higher than the vent, then you'll get the light coming thru it downwards (and i'd thin that the vent would actually focus it a bit outwards). IMO, if you turned the thing upside down then you might not get that light coming down thru it because if its upside down, the slots are angled so that the light would have to come from below.
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TAKE...LUCK!!!
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