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#1
05-06-2009, 04:28 AM
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I was going to say something about the PAR and shielding... but fkshiu got it already.
Mogul halides will usually beat double-ended bulbs because doulbe ended bulbs MUST have a shield for UV, while mogul-based bulbs do not. Though HQI's usually are brighter/stronger, that shield will almost always cause the bulb to fall in the poop-hole compared to an identical mogul-based bulb. This is all if your talking about the PAR - which should be a big part of what matters in choosing the bulb for coral response. Cheers, Chris
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No more tanks  - Laying off the ReefCrack for awhile!Cheers, Chris 
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#2
05-06-2009, 06:12 AM
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I'm currently running the Iwasaki 15k and just switched to a Vertex 175w e-ballast from a PFO pulse start tar ballast. I don't have a par meter but the Iwasaki bulb is significantly brighter with the e-ballast over the tar. Having said that, if you're comparing par output between a 175w Iwasaki mogul and 150 hqi bulb, you'd have to factor in the ballast choice as well.
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-Mason
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