The German-made Radium 20000K metal halide bulb offers excellent coloration and good intensity. It is crisp-white with a strong blue tint.
It brings out the fluorescent pigments in corals nicely. Fluorescent supplementation is usually not necessary, but can be used for added intensity and to simulate dawn and dusk.
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Nice Blue Color Review by Omie
Great light. It give a nice blue color to the tank and the colors of my corals increase!!! (Posted on 2/6/2011)