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#1
04-29-2008, 03:20 AM
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If I read your question right, your tank is 24" deep...then the lights should be the 250W as 175 may not give you good coverage all the way to the bottom.
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Mark...  290g Peninsula Display, 425g total volume. Setup Jan 2013. 
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#2
04-29-2008, 05:03 AM
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Go with the dual 175W MHs and use either the Iwasaki 15K bulb if on an electronic ballast or the AB 13K bulb if using a magnetic ballast. Put your SPS up top and the LPS down low.
Both the respective setups will provide as much if not more PAR/PPFD than an 250W XM 20k bulb. AB 175W 13K: http://www.reeflightinginfo.arvixe.c...&Submit=Search Iwasaki 175W 15k: http://www.reeflightinginfo.arvixe.c...&Submit=Search XM 250W 20k: http://www.reeflightinginfo.arvixe.c...&Submit=Search
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