Do three leg LEDs have a polarity?

[Che_Guitarra]

Sorry if this question is so basic and might cause offence

I'm building a guitar pedal with a three leg LED in the kit - first time i've ever toyed with one.
Three-leg LED polarity - there's no labelling on the PCB to advise a correct polarity, not does the LED seem to have any orientation indicators, so I guess i'm safe. But I better ask, just to be sure.

 

[David Kulka]

All LED's (all diodes) have polarity. You can check polarity with a DVM that has a diode check function by trying the leads in each direction and seeing which way causes the LED to glow. Or just try in your circuit in both directions and see which way works. Or check the datasheet if you can find it.

 

[JohnRoberts]

The three leg LEDs I've used in the past had a common cathode for the center lead. Look for a data sheet describing the LED.

JR