I hung my lights in such a way as they could slide out of the way, but also be raised straight upward.
In practice, I move them straight up all the time....and only slide them out of the way when I'm changing bulbs. The reason is that when I want to work on the tank, having the lights overhead helps me see what I'm doing.
I think I also get a nice suntan on my back at the same time!
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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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