LED Anode - Cathode Identification

[music6000]

If the leads have been cut, you can look for the FLAT machined at the base of the LED & determine its the CATHODE -

 

[chongmagic]

If the leads have been cut, you can look for the FLAT machined at the base of the LED & determine its the CATHODE -

View attachment 3255

Also if your DMM has diode measurements, you can determine that way as well, and check a LED before you install it.

 

[Chuck D. Bones]

Or get a battery, a 4.7K resistor and some jumper leads.