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High Color Rendering index (Ra95)LED bulb design

High Color Rendering index (Ra95)LED bulb design

  • 2020-07-17
  • Views:0

High Color Rendering index (Ra95)LED bulb design

(Summary description)

  • Categories:NEWS
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  • 2020-07-17
  • Views:0
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The higher the color rendering index of the light source, the more it can show the real color of the object. In the operating room, museum, art gallery, textile factory, study, reading room and other occasions, the requirements on color rendering index are very high. The color rendering index of sunlight is 100, and the color rendering index of LED lamps is generally between 70 and 80. To make LED lamps reach the color rendering index of 95, a new technology is often needed.

Implementation of high color rendering index LED
High rendering LED white light is usually achieved by using blue chip + yellow phosphor + red phosphor. Leds with different color rendering indexes can be obtained by adjusting the ratio of yellow powder and red powder.
The spectral figure of white light 6000K color temperature LED is as follows:
From the spectrum diagram, there are two peak wavelengths of blue light and green light, which indicates that the amount of blue light and green light is sufficient, while the amount of red light is insufficient. To improve the LED's color rendering index, the red component must be increased, that is, the red component must be increased.
There are two methods to improve the red component of LED. One is to increase the amount of red phosphor, but the efficiency of red phosphor is not high, so it is difficult to obtain double high LED products with high luminous efficiency and high color rendering index. The second is to add a red light chip in white light, which has a high luminous efficiency and can greatly improve the red light component. It is easier to obtain LED products with high luminous efficiency and color rendering.
Spectrogram of LED with high color rendering index:
1-Ra75 white light spectrum, 2- increased red light spectrum, 3- Red light spectrum

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