I recently added a radium on a 430 watt son agro ballast to my 75 gallon. I really like the light. It is a nice bluish/white, but not as bright as a 400 watt 10k or Iwasaki bulb.
As mentioned there is a lot of discussion on this board about the subject, so I won't bother with more details.
I have purchased a new 150 gallon to be set up in July/August and will probably go with two radiums and a 10k. I really like the color of the radium, but I would think that can be somewhat subjective as some still find it too blue. I certainly don't.
Bill
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