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LIGHTING AND VISUAL EFFECTS
Visual performance
Lighting for work covers a wide range of different working interiors and tasks: from offices and small workshops to huge factory halls, and from reading, writing and PC working tasks to fine precision work or heavy industrial tasks. The lighting quality should always be high enough to guarantee sufficient visual performance for the tasks concerned. However, a person's actual visual performance depends upon not only the quality of the lighting but also upon his or her own “seeing abilities”. In this respect, age is an important criterion, since lighting requirements increase with age. Figure 4 gives the relative amount of light required for reading a well-printed book, as a function of age. This research