Electronic – How to measure high power LED temperature

ledtemperature

I have a 100W LED module that I believe is overheating due to the heatsink being too small. I use a piece of anodised aluminium from an old fanless PSU. It's only 300g so far too small for 100W led so I added 120mm fan. I still feel it gets far too hot. I have an IR thermometer and it shows temperatures over 120C after a few minutes when measuring the led itself and 40C for the metal part of the led. Thermal grease in between but the led is not firmly fixed to the heatsink.

I am planning on using arduino with a basic temperature sensor to control cooling fan based on temperature and dim the led if it overheats. What is the correct way of measuring the temperature of the led and at what part of the led?

Here's the LED:

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Best Answer

Best way of measuring the junction temperature of an LED is by placing a thermocouple at the heat pad (or if the LED doesn't have a heat pad pin, get as close as you can to the anode pin). Secure the thermocouple using some type of thermally conductive epoxy/glue. Light up the LED and wait...

Read this and this for more information.

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