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from what i have seen, de are more efficient than mogul. however you kinda have to compare apples to apples, a 250 mogul to a 250 DE. Also one difference is the DE also need a uv glass sheild the moguls do not(it is built in). Other things to consider are electronic or magnetic ballasts, overdriving or not, reflectors, etc. Lighting is one of those things that is really hard to get a handle on for a lot of people including myself.
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