larger image 10yr Tritium Self-Luminous Exit Light $155.00 10 yr Tritium Self-luminous exit light requires no power to operate. They're always on and always meeting code! No electricity, batteries, bulbs, wiring or maintenance involved. Measures 12.75L x 8.25H x 1D larger image 20yr Tritium Self-Luminous Exit Light $185.00 20 yr Tritium Self-luminous exit light requires no power to operate. They're always on and always meeting code! No electricity, batteries, bulbs, wiring or maintenance involved. Measures 12.75L x 8.25H x 1D