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.
Questions on Radium 400W, 20,000K Metal Halide Bulb, Mogul Base
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best i ever used Review by redadeath
i used hamilton .. phonex .. nothing was better than radium 20 k it is not super blue as it simulates the ocean colour and pop up my corals colour (Posted on 3/19/2012)
Radiums are the only way to go Review by Hoang
Title says it all. I love Radium bulbs and Ill never buy anything else. These bulbs will make your coral glow!! I notice way better color with Radium bulbs compared to any other bulbs. Their a little pricey but your coral will thank you for it. (Posted on 2/7/2011)