I had a burnt out nav bulb so I figured what the heck? I replaced both with some Whelen Chroma LED lamps. It seemed a no brainer. I don't like the OR6502 series for one reason. This line in the ICA:
If any one LED fails, the unit must be repaired or replaced. Replace the entire unit for one dead LED? Really? How about a few extra so you can have one or two out?
With the Chroma, I can simply replace the bulb unit. Knowing that I had to either put in a relay or leave in one incandescent bulb in the circuit to prevent daytime dimming of the annunciator panel, I left the right aft white nav light incandescent for the time being. The install went good, it all worked. Then I was preparing to leave KMTN the other night and none of my LED nav lights worked. No green, no red, no white on the left aft..Only the incandescent worked. I fortunately kept my incandescent bulbs, so I changed them on the ramp. Took about 45 minutes but I got them all done and everything was ops normal. I flew home to Georgia that night. Today I tried the LED's again. Tried them one at a time. I tried an improved ground. No help, so I am back to incandescent. Don't know if I will try the OR6502 because of the ICA limitation.