Well the heat maxes out at 84 for a few hours during the afternoon then stays around 79. However anything below 86 hasn't seemed to impact this strain in my experience.
Good eye on the lights, I have:
Two 42 watt 2700Ks (2800 Lumens per)
Two 23 watt 2700Ks (1600 lumens per)
Two 26 watt 2700Ks (1570 lumens per)
And Three 18 watt 6500K bulbs (? Lumens)
for a total of = 236 watts and ~16,200 lumens.
All cramped inside ~6 cu ft cab (2 cu ft are used up by the fan space too so that makes it more like 4 cu ft) , so i think the heat isn't too bad considering