Avionic AMLCD Displays employ backlights for the illumination of the AMLCD device for viewing under all ambient conditions. Backlight illumination is typically achieved by the use of fluorescent lamps. Fluorescent lamps offer high efficacy, but need special conditioning for operation under all environmental conditioning. This conditioning requires a disproportionate amount of aircraft power and relatively long warm up time. The use of LED based backlights overcomes these characteristics. This paper presents comparison of the two technologies. A LED backlight for a fighter aircraft avionic display is briefly described.