User level

The use level is the horizontal and vertical level, which is to be illuminated by a light source - such as a desk. Depending on the lighting purpose, the standards define a reference point for the illuminance at which this is measured. In the case of sitting activities, this is usually at a height of 75cm above the ground, which corresponds to the height of a desk. In the case of traffic routes, which include stairs or corridors, the point of reference, on the other hand, is much lower at only 20cm.

How strongly the utility level should ultimately be illuminated is mainly related to the activity on it. In the workplace directive and DIN 12464, for example, values ​​of lighting strengths are recommended, such as around 50 lux for storage rooms and a total of 1500 lux for opticians. The more detailed and more precise a viewing task must be carried out on a utility level, the higher the illuminance must be.

In addition, there are differences in the direct lighting of the user level and only indirect lighting of them. The proportion of the luminous flux in direct radiation is around 90 to 100 percent and only around 10 percent for indirectors. This must also be taken into account in the lighting of user levels.