^^ those are pretty epic. Ive talked to him about those.
so I did some quick testing with just the 520.
I measured temperature both before and after twice for 50 seconds with five minutes in between.
I got a ambient temp. of 69.5F after 50 seconds it rose to 72.0F. both times the temps were about the same +/- 1/10th of a degree.
however, these measurements were taken from the face of the heatsink, after testing I moved the thermometer 1/2in back and the temp spiked to 78.1F after 50seconds. this is the area I believe that has been giving me the 'warm' sensation. regardless of temp. I plan on keeping duty cycle short.