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Old 10-15-2003, 01:01 PM   #1
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Join Date: Jun 2003
Location: cornwall, england
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metal halide?

how far away from the water surface should the lights be hung? i know it says a minimum of 20cm but is there a maximum and a optimum?

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Old 10-15-2003, 01:31 PM   #2
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I would say most would stay within 8 or 9 inches from the water surface.... This will help keep the intensity towards the bottom of the tank as opposed to having them higher.. A MH light is recommended to only light a 2 foot by 2 foot square... So, if your tank is 24" deep, and you have a 6" sand bed, technically, the lights should be 6" off the water surface for maximum efficiancy. This of couse is a little close, thus the 8 to 9 inch standard...HTH...
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