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Headlights with Light Emitting Diodes (LEDs) as the light source have come on the market but are complex and expensive. Recent work on new LED modules for headlights will allow a single LED module for each function, making LED headlights practical for mass market vehicles.

Light Emitting Diodes (LEDs) are commonly used for signaling and marking functions on commercial vehicles. Recent work on new LED modules will allow the use of LEDs for illumination functions.

Light emitting diode (LED) modules (standardized light sources) for use in automotive illumination design will soon become available in production volumes. Designing products with these devices is not the same as working with conventional tungsten halogen or high intensity discharge (HID or Xenon) light sources. There are a number of LED module characteristics which must be kept in mind when designing lighting systems.

This report consists of an investigation of human perceptions of narrow band width coloured light sources (Light Emitting Diode or LED) and wide band width coloured light sources (filtered incandescent). Any difference in perception of these light sources has many implications for design of lighting devices. Testing was performed to evaluate the differences, if any.