315 watt cmh is equall to a 600 watt hps, and the 630 watt cmh is equal to a 1000 watt hps. Way more coverage area than led, way less heat than hid and the full spectrum of the sun pret near. Bigger and better bud than led around the same price as the cheaper led that most buy and the bulbs are good for 2 years losing very little spectrum in that time. Plant that I had under the cmh are a week behind my hid lit girls and the buds are already bigger. Cheers friend