Calculation of Illumination Intensity for Clean Room Engineering
This method is used to calculate the average illuminance
(Luminous flux of light source) (CU) (MF) Illumination area
Suitable for indoor and sports lighting
Utilization coefficient: generally 0.4 for indoor use and 0.3 for sports use
1. Illumination distribution of lamps
2. Luminaire efficiency
3. The relative position of the lamp in the illuminated area
4. Reflected light in the surrounded area
The maintenance coefficient MF=(LLD) X (LDD) is generally taken as 0.7-0.8
Example 1:
Indoor lighting, 4 × 5 meter room, using 3 × 9 sets of 36W grid lights
Average illuminance=total luminous flux of the light source × CU × MF/Area
=(2500 × three × 9) × zero point four × 0.8 ÷ 4 ÷ 5
=1080 Lux
Conclusion: The average illumination is above 1000Lux
Example 2:
Gymnasium lighting, 20 × A 40 meter field,
60 sets of POWRSPOT 1000W metal halide lamps used
Average illuminance=total luminous flux of the light source × CU × MF/Area
=(105000 × 60) × zero point three × 0.8 ÷ 20 ÷ 40
=1890 Lux
Conclusion: The average horizontal illumination is above 1500Lux
Vertical illumination above 1000Lux (depending on installation location)
