Why the lighting design standards?

The purpose of setting up the lighting design standard is to have a uniform standard for lighting design and lighting quality evaluation.

As the lighting requirements, the number of light is undoubtedly the most important. The reason is very simple, in a certain range of light is very weak, can not see the object; the stronger the light, the better the ability to identify objects. If we have enough free energy, of course, we will be able to increase the illuminance of all places to the day. Unfortunately, our energy on earth is limited. Therefore, in order to obtain satisfactory lighting effect in the case of limited energy, many countries have done a lot of experiments and researches on the visual efficiency in order to develop a scientific and reasonable lighting standard.

The current standard of architectural lighting design in our country has stipulated the standard value of common illuminance. According to (LX) 0.5, 1, 3, 5, 10, 15, 20, 30, 50, 75, 100, 150, 200, 300, 5000, 500, 750, 1000, 1500, 2000, 3000, extremely, the pole and the level of the general agreement.

Many experiments have shown that just to identify the characteristics of the human face about 1cd/cm2 of illumination, the level of illumination at about 20lx lighting conditions. Therefore, 20lx is usually used as the minimum illumination of non working rooms in the world. It can be seen from the results of illumination and visual effect that it is difficult to read when illumination is less than 200lx, and the time to distinguish the visual object will be increased obviously. 200-500lx will change linearly with the change of illumination, and the improvement of visual effect is less obvious than 500lx. Therefore, 200lx is usually used as the minimum illumination of a continuous working room, and 500lx is usually used as a suitable illumination for a continuous working room. In this way, 300lx and 500lx has become the current teaching, office and other places of illumination standards. General classrooms, office lighting should be 300lx, art classrooms, office lighting standard is 500lx. Below the standard, the vision will be hurt, higher than the standard, wasted energy.

In fact, the illumination standard is not only the illuminance index, but also the color rendering index, the glare limit index, the uniformity, the contrast and the illumination energy conservation evaluation and so on.

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