LIGHTING : - RECOMMENDED ILLUMINANCE LEVELS (INDUSTRIAL BUILDINGS AND PROCESSES)
| Average Illuminance | |
| INDUSTRIAL BUILDINGS AND PROCESSES | |
| I) GENERAL FACTORY AREAS | |
| a) Canteens | 150 | 
| b) Clock-rooms | 100 | 
| c) Entrances, corridors, strairs | 100 | 
| II) FACTORY OUTDOOR AREAS | |
| Stockyards, main entrances and exit roads, car parks, | 20 | 
| internal factory roads | |
| III) AIRCRAFT FACTORIES AND MAINTENANCE HANGARS | |
| a) Stock parts productions | 450 | 
| b) Drilling, riveting, screw fastening sheet aluminium layout | 300 | 
| and template work, wing sections, cowling welding, | |
| sub-assembly, final assembly and inspection | 300 | 
| c) Maintenance and repair (bangars) | |
| IV) ASSEMBLE SHOPS | |
| a) Rough work, for example, frame assembly and | 150 | 
| assembly of heavy machinery | |
| b) Medium work, for example, machine parts, engine assembly, vehicle body assembly. | 300 | 
| c) Fine work, for example, radio and telephone equipment, | 700 | 
| typewriter and office machinery assembly | |
| d) Very fine work, for example, assembly of very small | 1500 | 
| precision mechanisms and instrument | |

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automatic screw fastening machine