I just upgraded from the “600 watt” LED that came with my grow tent to an HLG 300L Rspec. This light is brighter at its dimmest setting than my other light at 100%! I adjusted the height to 18 inches. My tent temps have climbed to 78 degrees at 50%RH. I still have about 3-4 weeks left on this grow. In case the plants like this light at 100%, how hot is too hot?
This is the light that came with the tent.