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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