Not to knock your bulbs, Deb, but it's well known the Sunburst 12k's are more for aesthetics or blue accentuation rather than for putting out PAR. So it's natural for things to darken up as they grow more zooxanthellae to recover the same amount of energy as htey would from under more PAR. Iwasaki's put out the most PAR for the buck, so I'm not surprised the clam has a lighter look to it, it doesn't need as much zooxanthellae as it did before.
Just my theory anyways.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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