What is Lux Lux
Overview
Light 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 light 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).
Illumination/illuminance on a light-irradiated surface is defined as light flux impinging on a unit area. Assuming that the luminous flux on the facet dS is dΦ, the illumination E on this facet is: E=dΦ/dS. 1lx=1lm/. When the luminous flux of an object uniformly illuminated by light is 1 lumen in an area of ​​1 square meter, its illuminance is 1 lux. Lumen is the unit of luminous flux. General conditions: 100,000 lx in summer sun; 10000 lx in cloudy outdoor; 100 lx in indoor fluorescent; 300 lx in 60 CW desk lamp from 60W; 1000 lx in TV studio; 10 lx in evening room; 0.1 lx in night light; 20cm away) 10 to 15lx.
Minimum illumination is a measure of camera sensitivity, in other words, the camera can see the available images in dark conditions. However, because there is no international standard for management, the first large CCD manufacturer has its own method of measuring the CCD sensitivity. Low-light camera is a surveillance camera that can still take clear images under low light conditions.
Illumination values ​​in common environments:
Light intensity under bright light in summer is 100,000 Lux (300,000-300,000 Lux)
Cloudy light of 10,000 Lux
Sunrise, sunset light intensity is 300 ~ 400Lux
Indoor fluorescent illumination is 30 to 50 Lux
0.3 to 0.03 Lux at night (bright moonlight)
0.003 to 0.0007 Lux (dark night)
Room (place) Reference plane and its height Lux standard value (Lux)
Residential Building Living Room (General Activity) 0.75m Level 100
Living Building Living Room (Writing & Reading) 0.75m Level 300 Appropriate Hybrid Lighting Residential Building Restaurant 0.75m Table 150
Library General Reading Room 0.75m Level 300
Office Building General Office 0.75m Level 300
General supermarket business hall 0.75m Level 300
Hospital waiting room, registration hall 0.75m Level 200
School classroom desk 300
School classroom blackboard blackboard 500
Common areas Common corridors, grounds for mobile areas 50
Public places Escalator ground 150
Industrial Construction Machining Roughing 0.75m Level 200
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