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Requirements for cylindrical illuminance

Good visual communication and recognition requires a sufficient level of brightness on objects and, above all, on people’s faces. Therefore, the surfaces and “spaces” in which people move or work have to be sufficiently illuminated. This wish can be fulfilled by ensuring sufficient levels of average (mean) cylindrical illuminance.

For indoor activity areas, the average (mean) cylindrical illuminance must be at least 50 lx, and uniformity (min/avg) ≥ 0.1, calculated 1.2 m above floor level.

For surfaces where the demand for visual communication is especially important, for example in offices and educational establishments, the maintained average (mean) cylindrical illuminance should not be less than 150 lx, with uniformity (min/avg) ≥ 0.1.