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Characteristics of light emitting diodes (LEDs), including physical size, flux levels, spectrum and spatial distribution, separate them from typical element sources, which are generally employed and measured for photometric and radiometric quantities. With an LED it is often difficult to achieve a high level of photometric or radiometric measurement accuracy, due to uncertainties within the measurement equipment and improper test setup. In addition, traditional photometers, because of their inability to simulate the response of the human eye at the ends of the visible spectrum, generate significantly flawed data when testing red, blue, and some styles of white LEDs.

The automotive industry, in recent years, has been seeking alternative methods for providing braking, turning, and parking lights on automobiles. Presently, tungsten is being used, but with its problems of slow response time, short life, and styling limitations alternative light sources are being researched. This paper will address the role that neon can play as a multi-colored light source and its pertinence to automotive lighting. The paper is targeted at technical advances in mercury-free, low pressure, novel rare gas lighting and the use of neon discharges as potential efficient red and amber light sources.