I just saw a bunch of acros and other SPS corals under a fairly new 400W Radium at Seacare.org. All I can say is the corals look fantastic under that light. It's running off a Blueline E-Ballast which was amazingly small and apparently runs cool to the touch.
Tim seems to be really happy with them on his grow-out tanks and says they are his new lamp of choice. After having seen it in person I have to agree they are nice looking.
In comparison, it doesn't seem as bright as my 250W 6500K Iwasaki, but definitely has a nice blue-white appearance and certainly makes the corals fluouresce (sp?).
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Cheers,
Andrew B.
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