How to Test LED Lights 1

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Updated: October 4, 2019

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All you need to test LED lights is a digital multimeter with a diode setting. First, connect the black and red test leads to the outlets on the front of the multimeter. Once the leads are connected, switch the dial on the front of the multimeter clockwise to reach the diode setting. This setting will either be labeled “diode” or have the diode circuit symbol, which looks like an arrow representing the cathode and anode. Put the black probe against the cathode of the LED, which is the shorter prong, and the red probe against the longer prong, the anode. When the probes are touching the cathode and anode of the LED, check that the value on the digital display of the multimeter is 1600 millivolts. If there is a different reading or no reading at all, this indicates that the LED light isn’t working properly. For more information on testing LED lights, like how to test with a coin cell battery, read on!

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