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post #2 of (permalink) Old 10-11-2011, 07:03 PM
Planted Tank Guru
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About the only fix available to you is using window screen, fiberglass insect screen from Home Depot, between the light and the tank. Each layer reduces the light intensity by about 40%, so one layer leaves you with 60%, two layers leaves you with 36%, 3 layers leaves you with 22%, etc. If that light has even moderately good reflectors you will need 3 layers of screen to drop the intensity to a good level.

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