Visual tasks are defined by light/dark and colour contrasts, by the size of details and by the speed at which contrasts need to be perceived. The harder the visual task, the higher the lighting level needs to be.

Task area
The task area is the part of the work place where the visual task is performed. The illuminance values set out in DIN EN 12464-1 apply to this area. Illuminance in the immediate surrounding area can be one grade lower.