250w Mh
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Originally Posted by fkshiu
A more fair comparison would be 250W MH versus 54w T5 HO (the 4-footers) as most 250W MH bulbs are employed over 4' and longer tanks. I do recall Grim Reefer (who is a strong t5 HO proponent) doing a PAR comparison of certain 250W MH bulbs head to head with Ice Cap overdriven 54" T5 HO using his own equipment (not Joshi's results). Although the MH bulbs weren't the highest PAR bulbs around (i.e. the Iwasaki 6500K), the T5s did come out on top.
For the record, I'm running a 3x39W T5-HO teklight over a 46 gallon bow over mainly LPS. I've been completely satisfied with their performance thus far. It's been 13 months since the current bulbs have been in and I have not noticed any drop-off at least with the naked eye or coral growth/behaviour.
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Actually most 250W MH are employed over 2 feet and usually a maximum of 3 feet. Anything over 3 feet you will experience a distinct spotlighting effect.
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