Stephane, although I can't say Radiums are dim, they are not as bright as my 400 10k bulbs. I think the color is awesome, but I do not need sunglasses. And I once tried a 400w Iwasaki...THAT was bright!!
Of the 400w bulbs I've tried, the Radiums are the least bright (to my eyes). However, coral growth has continued and the colors do look like they're improving.
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Brad
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