These wavelengths are difficult for the human visual system to process properly, and they cause perceived dazzle and glare effects in rain, fog and snow. The intent of selective yellow is to improve vision by removing short, blue to violet wavelengths from the projected light. However, selective yellow headlamps remain permitted throughout Europe on vehicles already so equipped, as well as in non-European locales such as Japan and New Zealand. Meanwhile, ECE Regulation 48 (enforced 08 October 2016) requires new vehicles to be equipped with headlamps emitting white light. Under ECE regulations, headlamps were formerly permitted to be either white or selective yellow-in France, selective yellow was mandatory for all vehicles' road-illumination lamps until 1993.īoth the internationalized European ECE Regulation 19 and North American SAE standard J583 permit selective yellow front fog lamps. Selective yellow is a colour for automotive lamps, particularly headlamps and other road-illumination lamps such as fog lamps. One of the first optic headlamp lenses, the Corning Conaphore made of selective yellow "Noviol" glass. Colour for automotive lamps Selective yellow (approximation)
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