Homework mesa illuminance values as a function of electric light source from working mesa height of vertical relationship

Key words: job mesa illuminance values; Electric light source from working mesa vertical height; Illumination test points and electric light source illuminate Angle cosine values; Inverse square law.

a, electric light source and lighting part of the physical concept of science and technology: 1, the luminous flux, electric light source the light energy produced, unit: lumen ( Ｌｍ） 。 2, intensity of illumination, electric light source illuminate direction, receives the light flux per unit area and unit: lux ( Ｌｘ） 。

2, the relationship between the function: 1, the electric light source and lamps and lanterns is selected, electric light source illuminate the luminous flux to the operating table for a fixed value. Homework mesa illuminance value, and electric light source from work mesa height of vertical, follow the inverse square law and cosine law.

: E h =

type: E h: working mesa illuminance values; L: electric light source illuminate to the luminous flux on the surface of the work station; Ｈ； Electric light source from working mesa vertical height; : illumination test points and electric light source illuminate Angle cosine. 2, when the intensity of illumination test point selected, vertical electric light source directly. Illumination test points and electric light source illuminate Angle between = 0, intensity of illumination test points and electric light source illuminate Angle cosine value = 1. Operation mesa illuminance values and electric light source, is apart from the work table a function of vertical height. For h = E. Mesa of illuminance values and electric light source: homework, mesa of vertical height from homework, follow the inverse square law. 3, for the convenience of application, working mesa illuminance value and vertical height and electric light source from work mesa, the corresponding part of the data. List as follows:

working mesa illuminance values as a function of electric light source from working mesa height of vertical relationship

vertical electric light source from homework mesa height variation H %

working mesa illuminance values increase multiples of 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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