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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