the problem is you cannot reproduce sunlight, that said leds use low energy but each led only produces a very specific wave length, the plants require a fairly wide spectrum for maximum results, so the best bet is to use a combo of light types, ex 600 watt hid + 600 watt hps is gonna be an excellent grow, 600 watts gives the most light for your energy bill. t5s ive seen do great for veg but i havent seen anything impressive from a flo during flower, if you want to go real cheap go to craigslist and search "grow light" I was able to pick up a 400 watt hid for 50 bucks, a 120 cf/m blower with new filter and a 600 watt hps in a sun enclosed hood with digital ballast for 200 bucks, nuff said.