The Electrical Marketplace tritium self luminous exit signs are a terrific solution to all aspects of mandatory compliance with local and state emergency lighting codes. These tritium exit signs are entirely self-powered and do not rely on electricity, back-up batteries or generators for its illumination. They can be mounted anywhere without wiring or outlets, and need no maintenance and are constructed to resist tampering and vandalism and can withstand explosive, corrosive, humid or other harsh environments.