LED= light emitting diode. Hps= quality smoke... Tried and true. Its all about spectrum and lumens, i like a hps with a more balanced green spectrum for grow, and standard red spectrum hps for bud. Green during growth, fantastic. Fluro, led or incandesant will grow flimsy stock and flavour is decreased as the spectrum is off. Just get a ballast of ebay or gumtree, there $70 100 for a 400 kit if you get classifieds. If you have grown with hps or mh, stay. If its ur 1st grow, find a ballast and get growing. There are some things leds are good for, supplementing on the sides or directed at the underside of canopy.