Luminance
Illuminance, commonly known as lux (lux), represents the luminous flux per unit area of the subject's surface. 1 lux is equivalent to 1 lumen/square meter, that is, the luminous flux irradiated vertically by a light source with a distance of one meter and a luminous intensity of 1 candle per square meter of the subject. Illuminance is an important indicator to measure the shooting environment.
The indoor lighting utilization coefficient method calculates the average illuminance:
When we usually do illuminance calculation, if we know the utilization coefficient "CU", we can easily use an empirical formula to quickly calculate to find the average illuminance value of the indoor working surface we want. We usually refer to this calculation method as "using the coefficient method to find the average illuminance", also known as the lumen coefficient method.
There are two types of illuminance calculation: rough calculation and precise calculation.
Example
For example, suppose that the overall illuminance should be 100 lux (lx) like a house, and even 90 lux (lx) will not have a big impact on life. However, if it is road lighting, the situation is different. Assuming that the road illuminance must be 20 lux (lx), if it is 18 lux (lx), it may cause frequent traffic accidents.
The same is true for a store, for example, the overall suitable illuminance of the store is 500 lux (lx), since an illuminance of 600 lux (lx) is used. Therefore, the number of lighting fixtures and the amount of electricity will increase, and it will have an economic impact.
