Luminance ratios

The distribution of light around the workplace and within the room is extremely important for appearance and room perception. Here are some recommendations on suitable luminance ratios to create a good balance.

Working areas and room surfaces

Illuminance for surfaces in a space should be correct in relation to illuminance on the working plane to conform to the luminance ratio requirements in the standard. For example, when using low-luminance luminaires and downlights there is a risk of the top of the walls and ceiling being too dark.

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Ceiling with indirect lighting

With indirect lighting the average luminance on the ceiling should not exceed 500 cd/m². Within limited areas of the ceiling, a maximum luminance of 1500 cd/m2 is acceptable. The gradient or luminance transition must not be overly sharp so that the lighting in the ceiling is not perceived as distracting and uneven. Luminance uniformity (Lmin/Lavg ) should not exceed 1:10.

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