About the same really from what I can tell so far but I haven't had many grows and this is my first good one. I like the LEDs because they run cooler and you don't need a lot for exhaust, plus they're full spectrum so the ladies are getting the light they need. HPS runs a bit hot and you need a little stronger exhaust to get the heat out, but growth seems a bit faster so I should get higher yields. Doing an experiment with it since it's the first time doing it side by side. I was going to rotate them out so they could spend a couple weeks at a time under each to even it out. I was thinking about it last night and I'm going to leave them so I can see the difference. I have some under straight HPS, some under straight LED and some in the middle with both. Should be interesting to see. I have a post on here with my grow and I'll be updating every couple weeks if you're interested in that.