4.0 Fundamentals of light properties
Good light and proper illumination are the most essential prerequisites for safe, accident-
free work and leisure environments.
Standard DIN 5035 Section 2 defines the standard values of inside work environments.
Type of room Nominal illumination in lux
Filled storage rooms 50
Storage rooms with locating tasks 100
Storage rooms with reading tasks 200
Canteens 200
Toilet facilities 100
Medical facilities 500
Engine rooms 100
Offices 500
Technical drawing rooms 750
Conference rooms 300
Rooms for colour tests 1000
Assembly rooms, testing stations 1000
Assembly rooms for small components 1500
DP facilities 500
Hallways in buildings 50
Traffic ways for vehicles in buildings 100
Staircases 100
Conveyor belts 100
Please refer to DIN 5035, section 2 or to special tables for further standard values and the
respective light colors.
The standard values listed above are reference values. Generally, they refer to horizontal wor-
king surfaces at a height of 0.85 m above floor level. The values specified for the various
types of traffic ways in buildings refer to a height of 0.2 m above floor level.The indications
are valid for a mean ageing condition of illumination systems.
The objective of calculating illumination levels is to determine the number of lamps neces-
sary and, thus, the required wattage. Although a detailed calculation of illumination values
is not feasible within the constraints of this leaflet, it is possible to provide the reader with a
simple, approximate example, using the watt rule (please refer to page 19, calculation ex-
ample).
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Fundamentals of light properties
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