dialight Our principal, Dialight is the industry's acknowledged leader in LED-based traffic signals. These devices use 90 percent less energy and last 10 times longer than incandescent lamps. Dialight’s extensive offering ensures compliance with the latest ITE LED traffic signal module specifications including the ITE VTCSH; Caltrans; and many other state and municipal DOT specifications. Dialight LED Obstruction solutions are fully FAA certified, Transport Canada, and ICAO compliant.