The only part you left out was the radiant heat which in many cases is alot more than ballast generated heat INSIDE THE TENT since it's in a grow tent here in this discussion and 90% of the time the ballast is OUTSIDE the tent. The HPS light makes alot more lumens in the high heat spectral range, i.e. "warm white" as opposed to the MH "cool white" and thus generates more ambient heat. But hey, let the trolling begin because you obviously now have to prove how big your pecker is. :jointsmile:

So to summarize: the HPS makes more light = more ambient heat.

You proved that in your post so thank you.