XM 400W Metal Halide Lamp, Single Socket. Great Color and Growth, without a premium price!
* Excellent with or without Actinic supplementation.
* Will Operate on a probe start ballast, ANSI M59.
* Standard Mogul base.
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Really Nice Bulbs! Review by ReefTECK
These are really bright, overall provide a well balanced light, the ultraviolet peaks enhance coloration really well without producing that overwhelming blue 20K look. In fact they could even be a little more blue overall for my tastes, but all corals are responding quite well. (Posted on 2/25/2010)