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Illumination intensity refers to the energy of visible light received on a unit area, referred to as illuminance, in units of Lux (Lux or Lx). In physical terms, used to indicate the intensity of illumination and the amount by which the surface area of ​​an object is illuminated. In photometry, "luminosity" is the density of luminous intensity in a given direction, but it is often misunderstood as illuminance. The international unit of illumination is the candlelight accepted by each square meter (Candela in Mainland China and Hong Kong and Macao). 
Second, the relationship between light intensity and camera <br> <br> in selecting an appropriate installation of surveillance cameras, the brightness must consider the monitoring site. Lux, a light level test unit, is used to indicate the illuminance of a specified area. In areas with good lighting, it is sufficient to use a general-purpose camera. However, in the environment where the illuminance of the color system is less than 2.0 Lux, it is necessary for the black-and-white system to select a higher-performance camera for an environment where the illuminance is less than 0.2 Lux. Use the illuminometer to measure the illuminance. If you do not have an illuminometer on hand, the levels of light measured in the table below are available for reference. 
indoor
Warehouse 20-75Lux
Emergency Channel 30-75 Lux
Staircase corridor 75-200Lux
Store 75-300Lux
Office and reception 300-500Lux
Bank 200-1000 Lux
Conference hall 300—1000 Lux
outdoor
Sunny 10000-1000000Lux
Cloudy 100-10000Lux
Dawn dusk 1 - 10 Lux
Full Moon Night 0.1-1 Lux
Cloudy Night 0.01—0.1 Lux
Starlight 0.001-0.01 Lux on sunny days
Under cloudy sky, 0.0001-0.001Lux
First, the concept of light intensity
September 24, 2021