I fully understand the comments about heat being heat, watts and such. But let me share this.
My grow tent is 32" x 32" x 64". You have seen my setup. I seldom use the exhaust vent. I always use the fan. The light I used for the past few years was 65 watt LED (actual use). The temperature inside my tent with door zipped all the way, was about 8 - 12 degrees F warmer than outside the tent. It was quite manageable with zipper door open only at bottom.
Now, the only thing different is that I am now using a 100 Watt (actual use) SF1000 Spider Farmer LED. My light levels are significantly higher, but the temperature inside the tent with zipper only on bottom is 2 1/2 degrees F warmer. It may be a little warmer this afternoon, and I will check, the light came on at 4:00 am. The humidity is 78%. Full disclosure, my basement is only 72 F this morning so even if it was a bit warmer, it would hardly make a difference. I don't use the tent in the summer because most everything is outside, except the plants in my plant propagation room.
So again, I won't argue with watts and heat and such that many consider on paper to be paramount, but from first hand observation, I have more light and less heat with my Spider Farmer light than I had with prior lighting system. To boot, the fan that runs 24/7 is apparently having very little impact. I am going to install another fan and set them up on a timer so that it is a bit closer to what nature would provide.
So I appreciate all your serious analysis of watts and heat, but it is obviously not all that cut and dry.
The secret is in the sauce.