Amber is one of several technically defined colors used in
automotive signal lamps. In North America,
SAE standard J578 governs the
colorimetry of vehicle lights, while outside North America the internationalized European
ECE regulations hold force. Both standards designate a range of orange-yellow hues in the
CIE color space as "amber". In the past, the ECE amber definition was more restrictive than the SAE definition, but the current ECE definition is identical to the more permissive SAE standard. The SAE formally uses the term "yellow amber", though the color is most often referred to as "yellow". This is not the same as
selective yellow, a color used in some fog lamps and
headlamps.
Formal definitions Previously,
ECE amber was defined according to the 1968 Convention on Road Traffic, as follows: Recent revisions to the ECE regulations have aligned
ECE Amber with
SAE Yellow, defined as follows: The entirety of these definitions lie outside the
gamut of the
sRGB color space — such a pure color cannot be represented using RGB primaries. The color box shown above is a desaturated approximation, produced by taking the
centroid of the standard definition and moving it towards the D65
white point, until it meets the sRGB gamut triangle. == Lighting ==