Funny that you should mention this ( shimmer or glimmer ) I just read this article from Advanced Aquarist by Dana Riddle a couple of days ago. http://www.advancedaquarist.com/2006/5/aafeature
I personally feel that it's all about the PAR or PPFD and if you can achieve the desired PPFD level with T5's... Then Metal halides wouldn't be any better. Once you reach a lighting saturation level it really doesn't improve your corals health or growth.
Now there's 2 cc's of aquarium water 
Jim
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90 Gallon glass, 135#'s of rock and 2" sand. 2-250w 20k XM metal halides. 2-95 watt actinic VHO, 4 powerheads, Coralife skimmer. Maroon Gold Striped Clown, Blue Chromis, Kole Tang, Pygmy Angel, Serpent Star, Brittle Star,Gorgonians, Mushrooms, Yellow Polyps, Turbo Snails & Blue Legged Hermits. 20 gal sump with Caulerpa, Mag 7 return pump. |