I have used 2 650wt LEDs in a 5x10 space. I got these lights for $209 on ebay. The spectrum is spot on. Good for all stages of grow. Although id recommend a third 650wt light for budding stage. Ive grown some dope buds with these girls. I realize the benefits of hps set ups, and I alleviate them, however unless you have a LARGE set up I dint see them beating LEDS. LEDs are available in all price ranges. Typically $60-$100 for 300-350wt compact LED. Haven't had a dam thing go wrong. If your looking for a budget, ultra energy efficient, low heat emitting, great yielding LED.....then you should seriously check your choice online market. I just thought ebay was a good deal....and is superior to amazon