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The bulb combination now consists of five ATI Aquablue Special (11,000K) and three ATI Blue Plus (Radium equivalent) for maximum intensity and yet still provides a balanced spectrum for coral growth and color.

After using T5 bulbs for over two years, and almost nine months in my current tank, I must say that I am very pleased with the results in terms of coral growth and color. Aside from quality T5 tubes, equally important are the mirror finish ATI parabolic reflectors that rest directly on the tubes for maximum reflectivity. One of the keys to getting good results with T5 bulbs, I believe, is to keep your SPS no more than 18" from the light source. For intensely colored SPS (i.e. reds, blues, pinks, neon yellows), I keep them less than 10" away. The T5 bulbs are no more than three inches from the water surface.