What is the color rendering index?
Color rendering index (CRI) is an international measure of measurement that describes how colors are portrayed under an artificial light source. The standard that compares artificial lighting is daylight, because daylight makes the widest variety of colors. On the other hand, artificial lighting can portray very many or very few colors depending on the nature of the light source. The color rendering index has many applications, especially in art and photography.
The appearance of the color changes under different light sources, because each light source emits different wavelengths of light. The visible spectrum of light, which can be perceived by the human eye, consists of wavelengths in the range of about 400-750 nanometers. Low -pressure sodium lamps, which are often used as street headlights, emit monochromatic light, which has a wavelength of about 589 nanometers. On the other hand, an ordinary bulb bulb emits many wavelengths of light.
Appears object certain color because it reflects a certain wavelength of the worldLa, which are then perceived by the eye. The low -pressure sodium lamp emits only in a narrow range of about 589 nanometers, so only one color can be reflected. All objects, regardless of their color in daylight, will appear in yellowish light under the sodium lamp light. Alternatively, many colors can be perceived in light bulb because the bulb releases a wide range of wavelengths.
The color rendering index quantifies the ability of artificial light sources to display color. The scale ranges from 0-100, while 0 is a poor ability to show color and 100 is the best ability. The low-pressure sodium lamp has an index of color rendering 0-18 and the bulb can have a CRI 99 or higher.
There is a difference between the color rendering index and the related measure of a known Jakplota color. Cri describes how colors appear under the light. On the other hand, the color temperature describes the factThe color of the light source and what kind of light emits. Higher color temperatures radiate blueer light and lower color temperatures look reddish. The color rendering index can be used as a basis for comparison only if two light sources also have the same color temperature.
Although the bulbs have a high CRI, they have a low color temperature of about 4,400 degrees Fahrenheit (2,427 degrees Celsius), unlike normal daylight, which has a color temperature of 7 640-8 540 degrees Fahrenheit (4.227-4.727 Degrees). Therefore, it is more difficult to distinguish shades of blue under the bulb than it would be in daylight. So although the bulb has an excellent ability to render color compared to other light sources of the same temperature color, it is not the most popular light source of overall when it comes to color rendering. Better light source should be both high CRI and color temperature, which is closer to natural sunlight.