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Old 12-04-2012, 04:10 PM   #10
Algae Grower
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Location: Western Philly Suburb
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Virtually no heat from the LED. That's the driving force for many people (particularly in the marine aquaria world). LED or light emitting diodes are generally adhered to an aluminum heat sink. basically it's an aluminum block with "fins" or slots cut into it. the surface area of the aluminum absorbs the head emitted from the LED and transfers it behind the fixture instead of like all other light sources directly toward the water's surface...
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