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Recently, there has been a proliferation of commercially available lamps with spectral light output differing from conventional halogen lamps for use in vehicle headlighting systems. For the last 20 to 30 years halogen lamps have been used as the standard source in most headlamp applications. These lamps produce the familiar blackbody-like continuous-spectrum output light. In the last ten years, high-intensity discharge (HID) light sources have come onto the market place with their characteristic discrete spectra and higher correlated color temperature (CCT). Even more recently, coated “blue” halogen lamps have become available which reduce the amount of long-wavelength light and shift the light output to higher CCTs. Currently, halogen lamps are under development that have glass envelopes doped with neodymium, which acts similarly to the coated lamps in reducing long-wavelength light and shifting the CCT to higher values.