What Are Self-Luminous Exit Signs?
Self-luminous, or radio-luminescent, exit signs use a non-electrical glass tube filled with tritium gas to provide light. The tube is coated with phosphor, a phosphorescent substance that absorbs light and re-emits it. Tritium gas provides low radiation that reacts with the phosphor coating to create light. Because of this chemical reaction, self-luminous exit signs can provide light without the use of electricity. Self-luminous exit signs are an excellent choice for energy efficiency because they use no electricity, and they also provide reliable guidance toward exits in cases of emergency where no electricity is available, making them a great safety tool as well.
