Key words: illuminance value of work surface; vertical height of electric light source from work surface; cosine value of illuminance test point and illumination angle of electric light source; inverse square law;
First, the physical concept of electric light source and lighting technology:
1. Luminous flux: The light energy generated by an electric light source, in units of lumens (Lm).
2 , illuminance: the luminous flux received per unit area in the direction of illumination of the electric light source, unit: lux (Lx).
Second, the function relationship:
1. After the electric light source and the lamp are selected, the luminous flux of the electric light source on the work surface is a fixed value. The illuminance value of the work surface is perpendicular to the height of the electric light source from the work surface, and follows the inverse square law and the cosine law.
Ie: E h = 
Where: E h : working table illuminance value;
L 
: the luminous flux of the electric light source on the work surface;
H; the vertical height of the electric light source from the work surface; 
: The cosine of the illumination test point and the illumination angle of the electric light source.
2. When the illuminance test point is selected, the electric light source is directly below the vertical. Illumination angle between illumination test point and electric light source 
= 0 , the cosine of the illumination test point and the illumination angle of the electric light source 
=1.
The illuminance value of the work surface is a function of the electric light source and the vertical height from the work surface. Then: E h = 
.
That is: the illuminance value of the work surface and the electric light source, the vertical height from the work surface, follow the inverse square law.
3. For the convenience of application, the part of the data corresponding to the illumination value of the work surface and the vertical height of the work surface from the electric light source. The list is as follows:
The operation table from the light source and the illuminance value operation as a function of the vertical height of the mesa
The electric light source is reduced from the vertical height of the work surface by the amount of change H% | The multiple of the work table illuminance value is increased by Lx% |
10% | 1.2345 times |
20% | 1.5625 times |
25% | 1.7778 times |
30% | 2.0408 times |
35% | 2.3669 times |
40% | 2.7778 times |
45% | 3.3058 times |
50% | 4.0000 times |
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