Meteorite Brick Wall

It gives light. A room backed with it needs no torches, and the glow spreads across the whole surface rather than pooling around a fixture, which is the look you want for a workshop or a forge. It still blocks spawns and still counts for housing, so nothing is given up by making it your default wall in a lit area.

You cannot switch it off. Anywhere you wanted dark, a bedroom nook or a horror themed room, this ruins the effect, and pulling walls back out is slower than swapping a few torches.