How to achieve the best color rendering of LED tube light source?
The evaluation method of the color rendering of led lamp light source, I hope it can be simple and practical. However, simplicity and practicality are often two contradictory requirements. In the CIE color system, the general color rendering index Ra is the product of such a compromise: it is relatively simple, and only needs a value within 100 to express the color rendering function of the light source. Ra=100 is considered to be the most ideal display. color. But sometimes people don't feel that way. For example, leaves under incandescent light do not look very bright. Where is the topic? Let's discuss what is the general color rendering index. For the sake of brevity, we only discuss the main composition method of the color rendering index Ra of the general LED tube here, and do not discuss its detailed calculation method. In fact, in our daily life, we often check the color rendering of the LED light source. Many people have such experience. When a careful lady buys clothes in a shopping mall, they often have to go outside to check the color of the clothes in the sunlight. In doing so, she is actually overhauling the color rendering of the light source in the shopping mall: look at the same piece of clothing, what is the difference in the color of the clothes under the lighting of the shopping mall light source and under the lighting of sunlight. So to describe the color rendering of a light source, two additional elements are required: sunlight (the reference light source) and clothing (the colored object). In the CIE color system, in order to determine the color rendering of the light source to be measured, the reference light source must be selected first, and the color of the illuminated object can be most perfectly displayed under the illumination of the reference light source. The CIE color system defines: when the correlated color temperature of the light source to be measured is lower than 5000K, the black body with the closest color temperature is used as the reference light source; when the correlated color temperature of the light source to be measured is greater than 5000K, the D light source with the closest color temperature is used as the reference light source. Here a D illuminant is a series of sunlight whose color coordinates can be represented numerically and are related to color temperature. After selecting a reference light source, you also need to select a colored object. Because of the diversity of colors, it is necessary to choose a set of scale colors so that they can adequately represent commonly used colors. The CIE color system has selected 8 colors, which have both a variety of shades and medium lightness and chromaticity. In the u-v color system, the special color rendering index Ri of the swatch can be obtained by measuring the difference of the color coordinates of each scale swatch under the illumination of the light source to be measured and the illumination of the reference light source, that is, the color shift ΔEi. (Ri=100—4.6ΔEi) The general color rendering index Ra is obtained by taking the arithmetic uniformity of the special color rendering index Ri measured by 8 standard color palettes. The maximum value of the general color rendering index Ra of the visible light source is 100, which is considered to be the best color rendering of the LED tube light source at this time.
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