The national standard of People's Republic of China (PRC), Building Lighting Design Standard (GB 50034-2004), 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 and floating areas in public places 50 escalator floor in public places 1 50 Rough machining of industrial construction machinery 0.75m horizontal plane 200 General machining tolerance of industrial construction machinery ≥0. 1mm 0.75m horizontal plane 300 should be added with precision machining tolerance of local lighting industrial construction machinery.