High-intensity bluish-green light-emitting diode (LED) lamps for traffic signals have been introduced by Hewlett-Packard making it the first LED producer to offer a full complement of high-intensity, high efficiency red, yellow and green LED lamp colours to traffic-signal manufacturers. The latest LEDs are designed to meet the colour and brightness requirements of green traffic signals based on US and many worldwide standards.
Manufacturers now can produce LED traffic signal heads that comply with Institute of Transportation Engineers standards for colour and brightness in all three colours and that consume 85% less energy than incandescent lamps.
Conventional 12in diameter traffic signals use incandescent lamps that consume from 116W to 150W. Current LED equivalents consume only 10W to 18W of electrical power.