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Self-luminous exit signs are powered by tritium gas, which produces brilliant 'EXIT' illumination for up to 20 years, depending on the model chosen. Tritium powered self-luminous exit signs are visible from up to 100 feet away and are an acceptable alternative to LED models. If you're in a situation where it's tough to run electricity to where you need to install an exit sign, this is the perfect solution. Choose between a red, green, or black face color (glowing green letters) and a white or black frame. Signs can be ordered either single-sided or double-sided with a 10 or 20-year lifespan. Unlike other retailers, we carry a select number of signs in stock at all times, so if you have an immediate need please call us right now at 800-282-5600.