Calculation areas

Ratio of illuminance and uniformity requirements

Ratios between different illuminances and uniformity requirements.

Ratio of illuminance and uniformity requirements
Illuminance,
working area  		 Illuminance,
immediate surrounding area		 Illuminance, peripheral
surrounding area in relation to immediate surrounding area
≥ 750 500 1/3
500 300 1/3
300 200       1/3
200 150 1/3
150 Working area 1/3
100 Working area 1/3
≤ 50 Working area 1/3

Uniformity within the working area depending on the vision task and activity. Uniformity within the immediate surrounding area min/avg at least 0.4. Uniformity within the peripheral surrounding area min/avg at least 0.1.

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Lighting of working areas

A working area is defined according to EN 12464-1 as the part of the workplace at which tasks are performed. For areas where the size and/or placement of the working area is unknown, the area where the tasks are to be performed shall be considered as the working area.

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Lighting of immediate surrounding area

Lighting of the immediate surrounding area shall be related to the lighting level within the working area and in addition create the conditions for well-balanced luminance distribution within the normal field of vision.

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Lighting of peripheral surrounding area

There are no defined requirements in Ljus & Rum for illuminance within the peripheral surrounding area, i.e. the area outside of the immediate surrounding area.

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