you'll hear a lot of negative stuff from people who have never flowered under LED, or people who have bought some cheep shit LED light. but from someone who has flowered the same cuts under various LED, HPS and CMH, i can say that LED's work just great - but dont expect to be able to get the same results from half the wattage. they are about 15-20% more efficient than HPS for the power actually used (remember that a 250hps actually uses 300 watts or thereabouts.)
these (sharksbreath) was flowered under 100w of LED's and came out about 1.2 gpw. quality was just as good as hps or cmh if not better. pics show them just before harvest at ll weeks
as for flouros, flouros can give decent buds but LED will p1ss all over them