Not all LEDs are created equal.
Author describes superiority of LEDs over incandescent lamps in traffic signal applications.
Behura, Nathaniel S. and Scott R. Evans. Compatibility of LED traffic signals with existing traffic signal field equipment. Incompatibility of LED signal modules with existing load switches and signal conflict monitors can result in malfunctions ranging from signal heads flickering to complete black-outs. This article examines these devices, analyzes the problems, and recommends some solutions. Signalling the Future.