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Light is light. Corals don't know, or care, what the source is. As long as you have the appropriate amount and color, you're good.
The issue is usually that the color range in T5 lamps is a lot greater than MH, CF or LED. Many corals grow better in light colors that don't develop the colorful algae that make corals "color up."
T5 lighting is still the second best lighting for coral growth (the sun being number one...), from both an efficiency and quality standpoint, but dropping the corals under 400W radiums for the last few weeks will color them up nicely for sale.
Jeff
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