I live in a 70s condo with step-down living room. After a guest fell I decided to do this: Using transparent Gorilla tape, I temporarily mounted a battery-powered string of tiny led lights under the moulding which extends just enough to enable me to affix the string. I plan to make it permanent--probably with white lights--once I see how well it works. Cost is under twenty bucks. When I'm ready to finalize this project the lights should be easy to install with a staple gun. I can easily turn them on when having company and leave them off most other times.
Q