Calculation formula and case analysis of outdoor lighting illuminance
Light intensity, also known as "illuminance", is a physical term that refers to the luminous flux received by an object per unit area. The unit is lux. Illuminance is the most important characteristic of the environmental conditions required for plant organisms to perform photosynthesis and accumulate organic matter speed and efficiency. Different crops respond differently to light intensity, and the same type of crop responds differently to light intensity at different growth and development stages.
Illumination intensity refers to the energy of visible light received per unit area, referred to as illuminance, and the unit is Lux (Lux or Lx). A physical term used to indicate the intensity of light and the degree to which the surface area of an object is illuminated. In photometry, "luminosity" is the density of luminous intensity in a given direction, but is often misinterpreted as illuminance. The international unit of illuminance is the candlelight received per square meter (mainland China, Hong Kong and Macao are called candela).
case analysis! What is the illuminance standard for a steelmaking workshop with a length of 136 meters, a width of 22 meters, and a height of 20 meters? How is it calculated? Calculation formula of illuminance: average illuminance (Eav) = total luminous flux of light source (N*Ф) * utilization factor (CU) * maintenance factor (MF) / area area (㎡)
(Suitable for indoor or stadium lighting calculations) Utilization factor: 0.4 for general indoor use, 0.3 for sports use Maintenance factor: 0.7-0.8 for general use Example: Indoor lighting: 4×5m room, 9 sets of 3×36W grille lights are used, Average illuminance = total luminous flux of light source × CU × MF / area = (2500 × 3 × 9) × 0.4 × 0.8 ÷ 4 ÷ 5 = 1080 Lux Conclusion: the average illuminance is above 1000 Lux. Illumination intensity refers to the energy of visible light received per unit area, referred to as illuminance, and the unit is Lux (Lux or Lx). A physical term used to indicate the intensity of light and the degree to which the surface area of an object is illuminated.
Calculation method of illuminance Calculation of average illuminance by coefficient method
Average illuminance (Eav) = total luminous flux of light source (N*Ф)*utilization factor (CU)*maintenance factor (MF)/area area (m2) (applicable to indoor or stadium lighting calculation) utilization factor: 0.4 for general indoor, Take 0.3 as maintenance factor: generally take 0.7~0.8]
Example 1: Indoor lighting: 4×5m room, using 9 sets of 3×36W grille lamps Average illuminance=total luminous flux of light source×CU×MF/area=(2500×3×9)×0.4×0.8÷4÷5 = 1080 Lux
Conclusion: The average illuminance is above 1000Lux Example 2: Stadium lighting: 20×40m venue, using 60 sets of POWRSPOT 1000W metal halide lamps
Average illuminance = total luminous flux of light source × CU × MF / area = (105000 × 60) × 0.3 × 0.8 ÷ 20 ÷ 40 = 1890 Lux
Conclusion: The average level of illuminance is above 1500Lux. The average illuminance design case of an office:
Design conditions: The length of the office is 18.2 meters, the width is 10.8 meters, the height of the ceiling is 2.8 meters, the height of the desktop is 0.85 meters, the utilization coefficient is 0.7, the maintenance coefficient is 0.8, and the number of lamps is 33 sets. What is the average illuminance in the office? Lamp solution: DiNiT 2X55W anti-glare daylight lamps are used for the lamps, with a luminous flux of 3000Lm, a color temperature of 3000K, and a color rendering of Ra90 or above. It can be obtained according to the formula:
Eav = (33 sets X 6000Lm X 0.7 X 0.8) ÷ (18.2m X 10.8m) = 110880.00 ÷ 196.56 m2 = 564.10Lux Remarks:
The lighting design must require an accurate utilization factor, otherwise there will be a large deviation, which will affect the size of the utilization factor. There are mainly the following factors: * Light distribution curve of the lamp * Light output ratio of the lamp * Indoor reflectivity, such as Ceiling, wall, work table, etc. * Indoor index size
