Anyone know how to measure Tj of high power COB LEDs?


Fully [H]
Jun 10, 2005
I have an array of 3 100w cob leds. Im worried about their operating temperatures.

The array is mounted on an aluminum heat exchanger, which has around 15ft of 1/4" copper tubing brazed in channels inside the aluminum surface, being cooled by a 3x 120mm double thick copper radiator. Should be enough dissipation to deal with 300w (actually, its 300w from the wall, so less with driver inefficiencies, which are not coupled to the cold plate)

I have an IR thermometer but its... giving me wacky readings from 80c-144c.

Any ideas?