put a dimmer on any incadescent bulb, run it around 95% of full voltage. Bulb life will be forever, they wouldnt burn out, but the insides of the glass will blacken and light output get so poor you will finally replace the bulb....
I saw this in a BIG chandlier at a hotels meeting room, for service training. The place was very dark, so much so people brought in extra lights just to see what we were working on.
Just a few of the hundred or so bulbs were brite, staff said those had burned out and been replaced