Värviedastusomadused

Värviedastusomadused, often translated as color rendering properties or color rendition, refers to the ability of a light source to accurately reproduce the colors of objects compared to a reference light source, typically natural daylight. This is a crucial factor in lighting design, especially in applications where accurate color perception is important, such as retail, art galleries, photography studios, and healthcare facilities.

The most common metric used to quantify color rendering is the Color Rendering Index (CRI). The CRI scale ranges from 0 to 100, where 100 represents perfect color rendering, meaning the light source produces colors indistinguishable from those under a reference illuminant. A CRI of 100 is typically assigned to daylight or a blackbody radiator at a specific color temperature. Generally, light sources with a CRI of 80 or above are considered to have good color rendering, while those with a CRI of 90 or above offer excellent color rendition.

However, the traditional CRI (Ra) only evaluates the general color rendering ability based on a set of eight standard color samples. More advanced metrics, such as the IES TM-30-15, provide a more comprehensive assessment by using a larger palette of 99 color samples and two metrics: the color fidelity index (Rf) and the color gamut index (Rg). Rf is analogous to CRI and indicates how accurately colors are rendered, while Rg indicates how much the colors are either compressed or expanded relative to the reference illuminant, providing information about color saturation. Understanding these properties helps in selecting appropriate lighting to achieve desired visual outcomes and ensure accurate color perception.