In short, the total amount of light emitted by the bulb (luminous flux) enters a certain surface layer with a certain intensity - luminous intensity (luminous intensity), and then the luminosity of this surface layer can be measured.

Relevant tests show that at the same time between 300lx and 500lx, as the illumination level increases, workers' satisfaction will significantly increase; at 500lx, workers' satisfaction is basically saturated, and the increase in illumination levels will not significantly change workers' evaluation of the lighting environment. Therefore, China's latest office lighting standard is 300 lx-500 lx, which is also the most suitable illumination for the work surface.

In addition, in the dining space, there must be enough light in the indoor environment and on the dining table to meet the basic dining needs of customers. According to the recommendations of the China Lighting Association in China's architectural lighting design standards, 200 lx is appropriate for dining table lighting.

China's architectural lighting design standards require that the illuminance at a 00.75m plane in a Chinese restaurant shall not be less than 200lx, and that in a Western restaurant shall not be less than 100lx. The illumination value of each space position shall be determined.