The only difference between SE and DE is the bulbs. DE plug into sockets on both ends, SE only on a single end. DE bulbs come in sizes up to 25w, the most common being either 150 or 250w. Never heard of a 400w DE. SE come from 70w up to 1000w. All bulbs will run off of several ballasts. Some bulbs run better off one style over another. Best to pick a bulb and then figure out which ballast runs is optimally.
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Brad
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