Is limelight still used today

Answer 1

Apparently it is still used as a demonstration tool in shop or science classes.

Since a practical, working limelight today would require pressurized sources of oxygen and a suitable fuel (acetylene, MAPP gas, or even propane), and would generate disagreeable vapors, is is virtually certain none are in use except as historical curiosities. The science class demos do not use a specially-built device; instead such a demo may be as simple as a lump of lime in forceps heated with a jeweler's oxy-propane welding torch.

Answer 2

Yes, limelight is still used today for theatrical lighting and effects. While it has been largely replaced by modern lighting technologies, limelight is still favored for its unique warm color temperature and aesthetic qualities in certain applications.