CCS ‘Natural Light LEDs’ use violet excitation and include all wavelengths of visible light from violet to red, and thus have characteristics extremely close to natural light from the sun.
The general color rendering index, which indicates the color reproducibility, is Ra98 achieving the highest level in the LED light industry.
This achieves the color of the illuminated object true to nature.
Also in your specified correlated color temperature (*1), the LEDs maintain Ra95 or higher. Furthermore, this achieves high values not only in the general color rendering index, but also in the special color indexes which express colors such as ‘primary colors’ and ‘skin color.’
(*1: The correlated color temperature is approx. 2700 to 5500 K.)
natural-light (high color rendering) LED regular white LED
What Are Color Rendering Properties?
“Color rendering” refers to the way we see the color of an object when a light source, such as a light bulb, fluorescent light, or LED light, is shown on that object.“Color rendering properties” refers to the properties for evaluating that rendering.Generally speaking, “a light source with good color rendering properties” refers to lights which accurately illuminate the color of the object respective to standard illuminants, and the highest value is set at a color rendering index of 100. In Japan, there are JIS standards which determine the color rendering index, allowing for color rendering properties to be quantified and compared.
General color rendering index Ra: Avg. value of R1 to R8 *Special color rendering index Ri: Individual evaluation of colors R1 to R15
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Natural-light LED
Ultraviolet excitation-type LED chips
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Blue, green, and red fluorescent substances
e.g. Ra95 min.
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High color rendering white LED
Blue excitation-type LED chips
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Green and red fluorescent substances
e.g. About Ra90
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White LED
Blue excitation LED chips
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Yellow fluorescent substances
e.g. Ra70 to 85
General white LEDs achieve white color based on the LED chip for blue excitation. However, CCS Natural Light LEDs are based on the LED chip for
violet excitation and include visible light from violet to red.
*We developed Natural Light LEDs in November of 2007.
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Natural Light LED
High color rendering properties (color reproducibility) in a wide range of color temperatures
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High Color Rendering White LED
Color rendering properties (color reproducibility) decrease in high color temperatures due to lack of short-wavelength components
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White LED
Low color rendering properties (color reproducibility) in all color temperatures
