Amber shift
Amber shiftis a phenomenon ofincandescent lampsin which the perceived warmth (orcolour temperature) of the light sources changes as larger amounts ofelectric currentflow through it.
Basic example
[edit]This can best be seen with domestic lighting which is controlled withdimmers.When the dimmer is turned down the light being produced also appears to be more of a warm, amber colour. Whereas when the light level is increased the light becomes more white.
Uses
[edit]This characteristic of incandescent lighting can be used for various practical applications where a different colour temperature of light is required.
Art exhibitions
[edit]Often an artist will want to show his or her work in high colour temperature light. The reason for this is because a higher colour temperature will give a more accurate representation of colours in paintings, photos, etc.
Some artists may use amber shift properties to accentuate the warmth of a piece.
Social and dining
[edit]Often restaurants, bars and other social gathering places will dim lighting to maximise amber shift. The reason for this is that the warmer (amber shifted) light showsskin tonesin a more attractive manner. Some interior designers also feel that warmed light gives a more intimate feel.
Counteracting amber shift
[edit]In cases where incandescent light is in use, but a high colour temperature is required, a technique called "colour temperature correction" may be used. This involves placing a "CT" light filter in front of a light source. To the naked eye this type of filter appears blue, but when put in front of an amber shifted light source it counteracts the dominant amber colours to produce a morewhite lightthrough a process known assubtractive mixing.