HLG 650R. They are bad boys. I wouldn’t even look at an led until they got the blurple out of them. Now I wouldn’t flower with anything less. I think it is more about the PPFD than the spectrum but I can’t handle the early blurple lights. You get these lights or a HID bulb to close to your plants it will cost you quality as well as quantity! Without Co2 enrichment and a dialed in nutrient mix anything over around 1000 PPFD will hurt your plants. Just like feeding to heavy. Anyone that says you can’t have too much light is wrong or has an unlimited supply of Co2 and their nutrients dialed in perfect. Still I have found anything over 1300 PPFD or so at the top of the canopy is waisted. Doesn’t seem to help any and maybe a gradual negative effect on your harvest. These are at 1300 PPFD with 1250 PPM Co2 levels. One fixture would have probably blast this 4x8 but I tend to overdo. LOL With the extra height of the Gorilla Grow tent or the 8 foot ceiling grow room these are really great lights. I also put the HLG UAV Bar on these for flowering. I run it from the first sign of frost on. I veg under Spider Farmer SF4000s now at 24” and 50% power or 600 PPFD top of canopy. You can’t look at the picture and really see the mass of these colas. They are waist tall trees. I’m running 3 flavors right now. 11 roses, Gorilla Glue #4, and Arkansas Skunk. The Skunk is outdoors. First time in many years for outdoors. I almost forgot how.