Thanks for stopping by. When i was just running the 2 bars 20x 10w chips w/2 ac fans with 203w power supply i could hold my hand on to the bar for atleast 5 secs until it felt hot and when i would turn off the light it was cool to the touch within a min. Temps in box stayed around 75. Now with 36 of them i can touch it for atleast 2 seconds and then it feels pretty hot. Temps in box are about 82 now. I used artic silver thermal adheasive. The aluminum bars are 1/8"x 1" x 18" and the smaller ones are 1/8" x3/4" x 18" the cooling pad has four fans i just used 2 1inch velcro strips to hold it in place. The fans blow upwards pulling the heat. For the chips says max operating temp is 176f 80c. Ill look at getting a radar gun to use just stick a sticker on the bar it should work. Or a thermal couple