Bulborama Industrial Grade Traffic Signal Lamps offer 10% energy savings and a 12 month average lifespan with 8,000 hour life ratings. Industrial Grade Traffic Lamps are a preferred choice for sign companies, municipalities, and airports and meet all I.T.E. requirements. Industrial Grade Traffic Lamps are equipped with 5 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 polished aluminum built in disc directs more light out the top of the lamp toward the signal lens, increasing the usable light while absorbing heat away from the filament and base to increase lamp life!