LED tube color rendering index Ra
1. The concept of color rendering index of led tube,
Color rendering index Both the sun and the incandescent lamp radiate a continuous spectrum. Objects will show their true colors under the illumination of sunlight and incandescent lamps, but when objects are illuminated by discontinuous spectrum gas discharge lamps, their colors will be distorted to varying degrees. The degree of the light source to the true color of the object is usually called the color rendering of the light source. In order to quantitatively evaluate the color rendering of the light source, the concept of color rendering index is introduced.
2. How is the LED color rendering index regulated?
Take the standard light source as the standard and set its color rendering index to be 100, and the color rendering index of other light sources are all lower than 100. The color rendering index is represented by Ra. The greater the value of Ra, the better the color rendering of the light source.
Three, LED tube color rendering index standard
Generally Ra is between 50-90. The color rendering index of LED white light is relatively higher than that of warm white light. The color rendering index of LED spotlights produced by general manufacturers is above 70. If you choose Ra higher than 80 for commercial lighting, the commercial distortion will be less and you can buy it. Ra90 and above, of course, there are few manufacturers with more than 90 and there are basically no stocks, and the price is relatively expensive. According to different purposes, lamps with different color rendering indexes can be selected appropriately, as long as it is enough.
Fourth, the relationship between LED color rendering index and light efficiency
The color rendering index is not unique to LEDs, but a parameter that all light sources have, which is the ability to restore colors. The color rendering index of daylight is 100, incandescent lamp is also 100, energy-saving lamp is 80-90, and LED is 70-90. The lower the color rendering index, the more distorted the color from the naked eye. The higher the color rendering, the lower the luminous efficiency. The high-power color rendering of 1w requires more than 80, the lumen requires 100, and the color temperature is about 5000k.
Five, the importance of R9 in the color rendering index
The so-called R9 is the ability to display red in the color rendering index of the lamp. The larger the value, the higher the reduction of red. Simply put, the higher the lamp R9, the better and brighter the effect will be illuminated on occasions such as fruits and flowers. In particular, the R9 value of LED spotlights, which are the mainstay of lighting in shopping malls, can't be negative.
