Small lighting knowledge | light source color rendering is what mean? How to say? - China lighting network

Human living and working in the sun for a long time, the night light is on fire. Under these conditions, people observe the color of the object have a relatively fixed understanding. That is to say, feel the color of the object under this condition is considered it the color of the 'real'. Some artificial light sources, such as fluorescent lamp, mercury lamp and sodium lamp, the light may be similar to light or sunlight, but there is one big difference between the spectral power distribution. As a result, people in these can see objects under artificial light color and under the condition of light or sunlight can see colours have different degrees of difference. Color rendering of light source is refers to the sun or a light of fire and other reference light source, a light show is 'real' level of performance as object color. 'Color rendering index' is measured by metering source under the illumination of the color of the object and the reference light color in line with the degree of indicators. Concrete method is to use some standard color sample, calculate its under a reference illuminant and metering source and the difference of color samples, the smaller the color difference, color rendering index, stay metering source of color is poor. Generally the color rendering index for maximum of 100, the general color rendering index of incandescent lamp, halogen lamp - in 95 Between 100, short arc xenon lamp is about 94 - 98, high color fluorescent lamp and metal halide lamp is about 80 - Is about 50-95, common fluorescent lamp 30-70, high fluorescence mercury lamp is about 20-40, high pressure sodium lamp for 25. Need accurate color work, must use high color rendering of light. Color rendering index is lower than 50 light source can only be used as a don't need to distinguish between colors, such as ordinary road lighting. Our country 'building lighting design standard' ( GB50034 - - - - - - - 2004). Provisions in the long-term work, lighting light source color rendering index should not be less than 80. But the place of industrial building production lighting ( The direct type lamps and lanterns) installation height more than 6 m , color rendering index can be lower than 80, but the minimum must be able to identify the safety color. YanZhiXiang

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