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New Metal Halide Lighting design??

design halide lighting metal
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New Metal Halide Lighting design??

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Hello Crew! Unbelievable site! I’ve just devoured Mr. Fenner’s book and I use this site daily. I am a fairly new aquarist and have some questions regarding MH lighting. I specifically interested in understanding the reasons for the height recommendations regarding MH lighting. I’ve seen the recommendations for 6-10 inches off the water for 175 Watt and 12 inches for 250 Watt lamps. Are these heights designed for safety, light levels, or heat dissipation? I realize that the short answer is probably “yes”. Why would you get a larger wattage lamp and then raise the height over the tank? I am in the midst of designing a 125 gallon reef tank. I’m als

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