Isolite Products

    Isolite products are self-luminous, tritium-powered exit signs that provide continuous, non-electrical illumination for emergency egress marking in commercial, industrial, and institutional buildings without wiring, batteries, or ongoing maintenance.

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    Isolite Self-Luminous Indoor Outdoor Exit Signs-A652
    Isolite Self-Luminous Indoor Outdoor Exit Signs
    A continuous non-electrical source of illumination, requires no external energy source & as such are energy efficient. On sale now, 10% off regular price. Starting at $414.77

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    About Isolite


    Isolite manufactures self-luminous exit signs built around tritium radioluminescence, a technology that eliminates the need for electrical power entirely. Rather than relying on wiring, backup batteries, or photoluminescent charging from ambient light, Isolite signs illuminate through a permanently sealed internal light source. Borosilicate glass tubes inside each sign are coated with phosphor and filled with tritium gas, a naturally occurring hydrogen isotope. As the tritium undergoes low-level beta decay, the emitted electrons continuously excite the phosphor coating, producing steady, visible illumination around the clock for the rated lifespan of the sign. The result is a sign that is always on, requires no power source, generates no electrical load, and demands no maintenance for its entire service life. Isolite signs are UL 924 listed, compliant with NFPA Life Safety Code 101, and meet OSHA egress marking requirements, making them a code-compliant option wherever exit signs are required by law.

    Isolite products are used in a wide range of environments where conventional electrical exit signs present challenges, including stairwells, tunnels, mechanical rooms, outdoor structures, cold storage facilities, wet locations, hazardous atmospheres, and any facility where consistent electrical supply cannot be guaranteed.

    Frequently Asked Questions About Isolite Products

    How does a self-luminous exit sign work without electricity?

    Isolite signs use tritium gas sealed inside borosilicate glass tubes coated with phosphor. Tritium undergoes natural beta decay, emitting low-energy electrons that continuously excite the phosphor coating and produce visible light. No external power source, battery, or light charging is needed at any point. The sign illuminates the moment it is installed and continues to do so for the duration of its rated lifespan.

    Is tritium safe?

    Yes. The beta radiation emitted by tritium has such low energy that it cannot penetrate a sheet of paper, let alone the sign's housing. Isolite signs are regulated by the U.S. Nuclear Regulatory Commission and meet all federal and state radioactive materials safety standards. In the unlikely event of tube damage, tritium gas is lighter than air, disperses rapidly, and poses no meaningful exposure risk. These signs are approved for use in schools, hospitals, commercial buildings, and public facilities across all 50 states and Canada.

    For buildings that require a photoluminescent rather than tritium-based egress solution, Koffler also carries a full range of photoluminescent exit signs and markings from other brands.

    Do I need a licensed electrician to install an Isolite sign?

    No. Because Isolite signs require no electrical connection of any kind, they can be installed by any qualified maintenance personnel using the included universal mounting bracket. This eliminates the installation cost associated with wiring conventional exit signs, which is a meaningful advantage in renovation projects or locations where electrical access is difficult.

    How long do Isolite signs last?

    Isolite signs are available in 10-year and 20-year lifespan models. Over time, the tritium naturally decays and the brightness gradually decreases. Signs remain UL 924 compliant throughout their rated lifespan. When a sign reaches the end of its service life, it must be returned to the manufacturer or an approved facility for certified disposal, as required by federal regulation.

    Where are self-luminous exit signs required or recommended?

    Self-luminous signs are the preferred or required solution in locations where reliable electrical power cannot be guaranteed, where wiring is impractical, or where the environment is incompatible with electrical fixtures. Common applications include stairwells, emergency egress corridors, mechanical rooms, cold storage and freezer facilities, outdoor structures, tunnels, underground parking, and hazardous or explosive-atmosphere environments. If you are unsure whether an Isolite sign is the right solution for your specific application, contact our team and we can help.