Bulborama Supra Life Traffic Signal Lamps offer 10% energy savings and a two-year average lifespan with 16,000 hour life ratings. Supra Life Traffic Lamps are the preferred choice of municipalities throughout North America and meet all I.T.E. requirements. Supra Life Traffic Lamps are equipped with 7 pure tungsten filament supports configured in a zig-zag pattern to resist shock and vibration. Krypton gas allows the filament to burn brighter at a reduced wattage, while limiting tungsten evaporation and ensuring long lamp life. The exclusive built in fuse wire protects sockets and controls from power surges and electrical arc out issues, providing added insurance from uncontrollable elements which cause standard lamps to fail prematurely.