Im also a sitter on the Mogul side. One of the reasons is because a mogul bulb does not have to be shielded for UV, while a DE bulb does. Typically shielding appropriate for DE bulbs cuts the PPFD down by alot, whereas with a mogul bulb it does not. On the same ballast, the same bulb in a mogul will always win out on the PPFD. Also, Mogul bulbs do not usually draw as much wattage as the HQI bulbs.
I have an LAIII(fullsize) with a mogul socket and cannot wait to use it on the tank. From the way the bulbs are made and where the sockets are, it seems to me a mogul might have a better spread of light.
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No more tanks  - Laying off the ReefCrack for awhile!
Cheers,
Chris
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