I purchased a inferred heat temp gun to test out this beast of a light's heat output and for when i make infusions, I'll know the exact temp now so dual purpose
I went all around the CT-660 looking for the coolest and hottest spots and this is what i found:
Coolest spot i found but i think i have it aimed on the red led or the heatsink besides the leds which might be cooler, either way nice temp.
Coolest Driver spot I found
Hottest spot I found on the driver
Top part of the led bar temps, hottest i found.
About the avg driver temp is 100F
The hottest spot i found was the LEDs 122F
I'm very impressed, my last led grow lights would burn my hand to the touch, this light has not burned me yet and doubt it will to be honest.
Bottomline, If heat is a issue for you, this light will not hurt you in the heat department, in fact it may drop your tent's overall temps if your current leds were as hot as mine were.