I have grown with led and hps and in my opinion led are brilliant at vegging but not that good at flowering. I find the buds just don't get that sticky feeling with the led lighting system. It saves a fortune on electricity and is great for no heat. But the hps flowers stickier buds. So I now use the leds for veg only and flower under hps 600w. That's just my opinion. I'm sure other people on here would be able to tell you the advantages and disadvantages. I only use the led for the first week of flowering as the girls are still lookin for the blue spectrum. My led is 450w I think and has veg and bloom switches on it.