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I'm not sure I fully understand, but I can tell you that I have a 2 X 250-watt fixture made by a reliable manyufacturer, and there's a strip of (I believe it's called "Lexite" under the bulbs by about three inches, which encloses the bottom of the fixture. I have a glass covering the top of the tank (to keep jumpers from getting out of the tank) under there by about another 2 1/2 to 3 inches because the fixture is elevated by mounts. The glass that covers the tank is 3/8".
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Most people get results...I seem to have consequences
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