The unit of the illuminance meter introduces the unit of the illuminance meter. Illuminance is the unit of the illuminometer. The physical meaning is the luminous flux per unit area. The unit of illumination is the number of lumens per square meter (Lm), also known as Lux: 1 Lux = 1 Lm/m2. As can be seen from the above formula, Lm is a unit of luminous flux, which is defined as the amount of light radiated by a surface area of ​​1/60 square meters of pure platinum at a melting temperature (about 1770 ° C) within a solid angle of 1 steradian.
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The explanation of the above control unit seems to be very theoretical and generally difficult to recognize. In order to compare the amount of the electronic scale with a more perceptual understanding, give an example:
A 100W incandescent lamp emits a total luminous flux of about 1200Lm. If the luminous flux is uniformly distributed on the half sphere, the illuminance values ​​at 1m and 5m from the source can be obtained by the following steps: radius 1m The hemisphere area is 2π×12=6.28 m2, and the illuminance value at 1 m from the light source is 1200 Lm/6.28 m2=191 Lux.
Similarly, the area of ​​the hemisphere with a radius of 5 m is: 2π × 52 = 157 m2, and the illuminance value at 5 m from the light source is 1200 L DIN cup m / 157 m2 = 7.64 Lux.
How much illumination is there in general in our lives?
Summer is about 100,000 LUX in the sun;
The outdoor illuminance on cloudy days is 10000 LUX;
The indoor fluorescent lamp illumination is 100 LUX;
We have an illuminance of 300 lux on a 60 cm tabletop from a 60W table lamp;
The illuminance of the live broadcast of the TV station is 1000 LUX;
The illumination in the room at dusk is 10 LUX;
The illumination of the night street light is 0.1 LUX;
The candle illuminance (at a distance of 20 cm) is 10-15 LUX.
Having said that, everyone should have a more perceptual understanding of the instrument unit. In fact, the application of the illuminance meter is very wide, such as factory buildings, schools, libraries, business buildings, hotels, commercial exhibition halls, laboratories, computer rooms, etc. In these places, the illuminance meter should be used. It can be exaggerated to say that as long as there is light, it is possible to use the illuminometer to measure the current illuminance. Now give you a more suitable reference value for the illuminance of the place.
Production workshop 10~500LUX
Sunny day: 30000~300000LUX
Cloudy: 3000LUX
Office: 30~50LUX
Sunrise and Sunset: 300LUX
Restaurant: 10~30LUX
Full moon: 0.3~0.03LUX
Corridor 5~10LUX
Starlight: 0.0002~0.00002LUX
Parking lot: 1~5LUX
Exhibition color dark night: 0.003~0.0007LUX
Under normal circumstances, the DIN cup is more comfortable in the illumination environment of about 250-750 LUX, too high or too illuminating, it also hurts the human eye, the most direct is myopia, the vast majority of myopia is in the illumination It is worthy of our attention to read books for a long time or use excessive eyes in a low environment.
For information on the illuminometer, please refer to: ht bending tester tp://
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