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Old 02-22-2011, 10:16 AM   #11
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all of the lighting we use is full spectrum, so unless you use a very low kelvin bulb, actinic light is present in the t-5s and halides, but corals use that light for photosynthesis. actinic light is used to bring out the color in corals.
take a look at this. it will explain a little.

Saltwater Aquarium Lighting - Coral Lighting - How Corals Grow - Aquarium Lights and Lighting
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thanks,
Doug
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