To settle debate just look at btu’s clearly cmh/lec less than hps but more then LED ... ok yea that doesn’t directly translate to temp raising but these three are so wildly apart that should be enough to settle that .,. I don’t veg under my 315s and I’ve run both 630 and two 315s on movers the 630 is def hotter but that’s largly cause of the dual ballasts and I’m yet to see that with a remote ballast... truth is I sold my 630 after three years and bought another 315 and a mover ... less heat remote ballasts OUTSIDE OF TENT and no hot spots ... for th record I veg under a NEXTLIGHT VEG8 saves the power over the 8-bulb T5