We just lightened our bank account by having all our 1920s knob&tube wiring replaced. With K&T running through the attic we couldn’t insulate. A former owner had the breaker box installed, and anything reachable through the open basement ceiling was replaced, however we had several of the old outlets still hot. There were two odd keyhole shaped plates in two rooms. They were painted with several coats through the years. The electrician said they were old 220v heater outlets for 1920s electric heaters. A few minutes later he came up to announce that one of them was still hot!
Anyhow, all our ceiling lights seem brighter. They all got LEDs a while ago, so it’s not a bulb change. Are the new electrons bigger or faster than the old ones? Less resistance?