Wow... this is a bit disturbing. As a new grower, I depend on the manufactures recommendations. My app says I should be at 75% power for veg, I just started that today.
Heat is an issue for me too. Currently 87.6 Degrees F and 45.4% humidity. (humidifier is running, the added heat seems to dry the air in the tent. I dropped to 36% humidity before I turned the humidifier back on.
I have the oscillating fan that came with the tent blowing over the lights to help keep them cool. (maybe I need another) I am going to try to move the light power unit outside the tent as you have shown to keep it cooler in there. I know it detaches from the light, I just need to see if the cord is long enough or if I can get an extension for it.