As far as my reading goes, HPS is better at spreading over a wider area, while LED is better at penetrating deep into the canopy to lower nodes. I use LED, and I still chop the lower stuff off, as the canopy is so thick, nothing's getting thru. By chopping off the stuff that's low down, and really not getting lit, you're essentially removing "leech buds" which will suck the nutrients up that could have gone to the big colas, making them even bigger, and more potent. All you're losing is popcorn bud that will never amount to much, and fan leaves that aren't pulling their weight by photosynthesizing (spelling?). You'll have better circulation, so there's less chance of and mold setting in on your buds, and your humidity will drop a bit easier, which you want as low as you can get, in flower. Just my opinion, but I'd defoliate for sure.