Lx (lux) is the unit of illumination.
The standard value of illuminance is classified as the smallest change of illuminance obviously felt in subjective effect, and the difference of illuminance is about 1.5 times, which is basically consistent with the standard classification of indoor workplace lighting of CIE International Luminous Committee S008/E-200 1. The national standard GB 50034-20 13 of People's Republic of China (PRC) stipulates the general illumination standard values of newly built, rebuilt and expanded residential, public and industrial buildings. Reference plane of room (place) and its standard value of high illumination (lx) Living room of residential building (general activities) 0.75m horizontal plane/living room of residential building (writing and reading) 0.75m horizontal plane 300 Suitable for mixed lighting living building dining room 0.75m dining table 1 50 library general reading room 0.75m horizontal plane 300 general office building 0.75m horizontal plane 300 general supermarket business hall 0.75m horizontal plane 300 hospital waiting room, registration hall 0.75m horizontal plane 200 school classroom class desktop 300 school classroom blackboard surface 500 common corridors in public places, Floating area floor 50 escalator floor in public places 50 industrial construction machinery rough machining 0.75m horizontal plane 200 general machining tolerance of industrial construction machinery ≥0. 1mm0.75m horizontal plane 300 should be supplemented by precision machining tolerance of local lighting industrial construction machinery.