I've often wondered if the ballast/bulbs behave differently if they are the 1st or 2nd item to draw power from a particular circuit.
I'm not sure that this comment helps you in any way, but your question made me think about it again.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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