Fixture
As stated earlier ... fan etc... but I think you'll be OK down to 8 inches, down to 4 inches if there's no splash or salt spray as long as you can transport the heat. I would see to it that none of your corals are closer than a foot to the light itself. I see no problems with using a halogen fixture retrofitted as they get quite hot as well. One thing to make sure of though is to use the glass as a UV shield as HQI bulbs aren't UV shielded.
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135G Mixed Reef. Bullet 2, 25 gal refugium, 2 X250W MH + 4X 96W PC\'s, DIY Calcium Reactor, Coralife 1/6 HP Chiller, Phosban, Tunze, 2 closed loops & SQWD\'s, Seios, Coralife 4 stage RO/DI & a bunch of other expensive gadgets... I may never retire, but I'm gonnahavahelluvanaquarium!
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