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Bertoni's correct. Look at Tek5 fixtures by Sunlight Supply. Here's a link to a great retailer who can give you TONS of information on the fixture. They have a reflector that's made up of individual reflectors that are bent around each bulb and then welded together to make one reflector with several "gull wing" bends around each bulb. This creates much more efficient lighting and directs light from all around each bulb DOWN into the water. They are more expensive but well worth it. I've got a 48" unit with 6 bulbs over my 75 and am keeping SPS and Clams happy as can be.
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