I ran my Advanced LED ARC Series 2.0 400 LED light overnight to see how much heat it generates in the orchid tent. With my basement being about 60 degrees F, the ARC Series 2.0 LED light warmed the tent up to 70 degrees F after 8-9 hours at 100% brightness. When I ran the light at 50% brightness the night before, the tent stayed around 62 degrees F which was, basically, unchanged, from when the test began (although I failed to run the circulating fan for the 50% brightness test).
Since I'm growing orchids in my tent, I don't anticipate using the light at 100% power, so I'll need to additional heating to achieve my desired "daytime" temps of 75-80 degrees F. Your results will vary depending on your environment and tent size, but I hope this is of some help if you're considering an ARC Series 2.0 400 grow light.