I've used both and I like both, back when I used DE's the best bulb you could get were 10K's, now we have the same choices (almost) in both DE and SE..I've been running 400 watt SE's for the past 4-5 years, I'm going to soon be switching to 250 watt DE's..
Tell us about your tank.
You can get a 250 watt HQI ballast and run both if you can't decide.
well, about my tank right now i have 260 watts of pcs and only have one colony polyp group ,about 8 bullseye mushrooms and 1 of those leather toadstools. i want to be able to have anything so i was thinking of getting 2 250 watt mh but i dont know if i want to go de or se.
its also a 90 gallon incase you didnt see my profile.
i am wondering which of the mh run hotter DE or SE?
Hey Reef what is the decent reflector you have your DE's in? That is my problem with the DE's you have to have them in the housings and I'm just not crazy about that, they would take up less room....I guess that's the trade off