How to maintain the illumination of the working surface

Abstract

The present invention provides a method for maintaining illuminance on a working surface, the method comprising the following steps: (A1) a light source emits illuminating light; (A2) collecting ambient light and the reflected light of the illuminating light on the working surface to obtain Total light intensity I, red light intensity I R , green light intensity I G and blue light intensity I B ; (A3) the light intensity I R , light intensity I G and light intensity I B Convert to RGB values, respectively R 0 , G 0 , B 0 (A4) obtain a, b and D; (A5) obtain the correction value ΔI of the total light intensity I according to the change value ΔD of D; (A6) obtain the illuminance E according to the correction value ΔI; (A7) obtain the illuminance E according to the illuminance E. Illumination preset value E 0 And adjust the light output of the light source, so as to maintain the stability of the illuminance of the working surface when the color of the working surface changes. The invention has the advantages of good illuminance stability on the working surface and the like, and can be widely used in indoor lighting, such as classrooms.

Description

technical field [0001] The invention relates to the adjustment of the light source, in particular to the method and method for maintaining the illuminance of the working surface. Background technique [0002] Since relevant authorities have promulgated national standards and local standards to regulate classroom lighting, some schools have adopted new LED light sources to replace old ordinary fluorescent lamps or tricolor fluorescent lamps. These new LED lights can meet the color temperature and illuminance specified by classroom lights. Uniformity and the specified illuminance value above 300lx. With the continuous development and improvement of these new lights, and in response to the call for energy saving, the classroom intelligent lighting control system was proposed and realized. The classroom intelligent lighting control system can initially realize the opening and closing and adjustment of classroom lights. A small number of control systems use photosensitive device...

AI Technical Summary

Problems solved by technology

However, when major changes occur on the working surface, such as the overall desktop color, relative position, etc., the light reflection ability of the working surface changes greatly, which affects the size of the collected light

The conventional photoelectric device detects the change of ambient light by collecting light. If the error of collecting light caused by the color of the working surface is not eliminated, it will not be able to accurately adjust the light power change of the light source, which will have a relatively large impact on the uniformity of the illumination of the working surface. big impact

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