How do you test a light emitting diode?

Answer 1

You can test it by puting it in forward bias with a resistor. Use a dc voltage source of 5 volts and put it in series with 250 Ohms resistor. Or use 9volts with a 450 Ohms resistor. Basically you need 20mA of forward current usually. Smaller current will reduce brightness.

Answer 2

When you test led light, you should know what's relevant parameters you will test? Such as lumen, color temperature, distribution intensity curve, IES file, EMC/EMI test and so on. By the way, you should prepare the suitable instruments to match your led lights, with more, you should know some relevant internation standards, because your test should meet relevant standards. If you want know more about this, you can reference here: http://blog.lisungroup.com

Answer 3

To test an ordinary semiconductor diode use a multimeter to verify that it conducts in one direction but not in the other.

Testing of other types of diodes (e.g. zener diode, tunnel diode, gunn diode, Peltier heat pump diode, photodiode, PIN diode, varactor diode, light emitting diode, LASER diode, vacuum tube diode) is more complicated and often requires special test equipment unique to that type of diode.