Makes sense. Edison worked on improving the carbon arc lamps and a ready 110 VDC supply was there.

Arcs were not the best idea for light and were phased out: https://edisontechcenter.org/ArcLamps.html

Edison was not the inventor of the light bulb, but as an electrical contractor supplied the DC power, meters, wiring and fixtures, as well as an improved incandescent lamp.

I'm fully switched over to LED lamps. I've seen a few fail, but not at the level of incandescents. I can't remember the last time I flipped on the bathroom switch only to have the light bulb go out on me.