BRIGHT FUTURE: Beyond their phenomenal reliability, LEDs also offer low current consumption, cool beam temperatures and infinite customisation options, making them ideal for rolling stock interior illumination

摘要

THE LIGHT-EMITTING Diode (LED) continues to revolutionise the lighting industry. In recent years, rapid advances in technology have been made, transforming the potential usage of the device from panel indication applications to a viable source of illumination. Although a newcomer to the lighting industry, the device is well understood by the electronics industry from where it originated. Basically, the device utilises a solid-state junction to produce photons (light output). As there is no fragile filament, the device is very robust and well suited to high-shock and vibration environments such as rail-car interior lighting. Unlike a filament lamp, the LED emitter must be supplied by constant current rather than a voltage-regulated power supply. Additionally, suitable lens arrangements are necessary to focus the light output into a usable beam.