@johny sunset
I just installed mine!
1000W HID + ballast puts out a lot of heat. The HLG-600H puts out a lot of heat less than a HID but still, too hot to hold your hand on the heatsink for more than 60 seconds, which I guess is around 70-80C. The heatsink runs the whole surface area of the light 29" x 15.5" . To give perspective on the amount of heat these fixtures actually put out, in my tent with 2.4kw HPS vs. 1.2kw HLG LED the temp would be about 6C cooler with LED. And I had only my bulbs in the tent, the ballasts were outside...with the LED everything is inside the tent.
So like maybe 40-50% of the heat output of HID on these LED fixtures. They are bright though, the camera can't capture it properly. Nice even distribution too. I noticed the HLG-240H put out a lot less heat, you could hold your hand on the heatsink as long as you want, likely because it is not being driven as high by the driver as the 600H. What I like about these lights is everything is solid state except the drivers which range from 70$-140$ on Arrow
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