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#19
12-31-2008, 12:51 AM
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You could certainly get some bleaching of even Acropora sp. at 16" depth with 8 HO T5s - especially if not acclimated properly. And especially if a quality fixture with active cooling is used.
Steve, That quote you were asking about isn't from the article. The PAR of 1100 is from the article but the portion about 2 x 250W MH producing this comes from Apogee measured values from a hobbyist's tank. While 1 250W MH produces the values you've reported the cumulative effect where they overlap with 2 x 250W MH could certainly produce that level of PAR at several spots in the tank - especially with a high quality reflector. For comparison see the picture below where 6 x 39W HO T5s in a crappy Tek light produced the PAR levels seen in the picture: http://i85.photobucket.com/albums/k72/jartanyon/par.jpg Fijiblue, the same hobbyist who was running the T5s in the picture above decided to try MH again with 2 x 250W MH over that same tank and found he was getting over 1100 PAR at the surface.
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SPS Dedicated 24x24x20 Trimless Tank | 20 g Sump | Bubbble King Mini 160 Protein Skimmer w/ Avast Swabbie | NP Biopellets in TLF Phosban Reactor | ATI Sunpower 6 x 24W T5HO Fixture | EcoTech Vortech MP20 | Modified Tunze Nanostream 6025 | Eheim 1260 Return Pump | GHL Profilux Standalone Doser dosing B-Ionic | Steel Frame Epoxy Coated Stand with Maple Panels embedded with Neodymium Magnets "Mens sana in corpore sano" Last edited by Canadian; 12-31-2008 at 12:54 AM. 
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