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Illuminance

The illuminance is a calculated value that says how light an entire room or a certain area is in it. For some areas, such as jobs and manufacturing facilities, the minimum requirements for those in DIN EN 12464-1 are set. The illuminance is given in Lux (LX) and abbreviated with the letter E. It indicates the luminous flux, which meets a certain area from a light source.

You get a lux when the luminous flux of a lumen illuminates exactly one square meter. This is measured with a luxmeter on horizontal and vertical surfaces.

Overall, however, the illuminance does not describe the exact brightness impression of a room, since it depends on several factors. Above all, the reflection properties of the areas and walls also play an important role here, for example, since a white space with the same illuminance looks much brighter than a dark painter.

In addition, the light distribution of a lamp is not absolutely even, which is why norms usually indicate the so -called medium illumination. This takes into account the unevenness arithmetically and can therefore be used as a standard.

Examples:

  • Sunlight: 100,000 LX
  • Workplace: 500 LX
  • Traffic zone: 100 LX
  • Candle (1 m away): 1 LX

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