The light source
The light source under which we look at something is crucial, as we see a color. Consider a colored object under an incandescent lamp, so does the paint on us completely different when we consider the same object under the current modern halogen lighting, or perhaps in the open daylight. But even in daylight, it is again important to what time we look at the color or whether it is cloudy or is cloudy. responsible for the different color effects, the shares of electromagnetic waves (400 - 700 nm) in the light. Daylight with a maximum distribution of the electromagnetic waves would be desirable for optimal tooth color determination. The even distribution is important not to have too high a red (as at sunrise) or an excessive amount of blue in the light spectrum and thus to confuse the viewer.
So now to make a consistent and accurate color selection of teeth, it is probably too critical, rely on a light source, to every day and night time (think of the winter months) in equal measure is available. This is then to artificial daylight. To create this artificial daylight, we need lamps flicker. These lamps must turn to meet certain requirements in order to perform an accurate color determination can. The first is the color of light would be about 5500 ° - 6000 ° Kelvin to mention, the other a light intensity, which should lie at about 1500 lux.
Measurements of light color on dentists and dental companies could be found that the light at the dentist's chair often a color temperature of about 3200 ° - 4500 ° K and the work light in the laboratory 4500-5500 ° K exhibit. But such differences must inevitably lead to a different color perception. 
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