Footcandles and Lux
To demystify the lighting discussion, here are some recommended
lighting levels that will give you a feeling for the amount of light
you'll find under various circumstances.
I had to add the values for Lux because most lighting engineers in
this country still use footcandles. Wilhelm's use of Lux as a measure
of illumination has caused a certain amount of confusion.
Recommended Light Levels
Task Area Footcandles Lux(approx)
Corridors/Stairways/Restrooms 10-20 107-214
Storage Rooms 10-50 107-538
Conference Rooms 20-50 214-538
General Offices 50-100 538-1070
Drafting/Accounting 100-200 1070-2140
Areas with VDTs 75 807
Classrooms 50-75 538-807
Cafeterias 50 538
Gymnasiums 30-50 322-538
Merchandising 30-150 322-1614
Manufacturing Assembly 50-500 538-5380
Note: to find equivalent Lux,
multiply footcandles by 10.76391
Wilhelm's tests simulate a viewing level of 450 Lux.
Tony Karp, TLC Systems Corp tkarp@tlc-systems.com
Visit our web sites:
Techno-Impressionist Museum: http://www.techno-impressionist.com
TLC Systems: http://www.tlc-systems.com
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