Illumination uniformity for classroom writing board light greater than 0.8
In accordance with Annex A.4 of China Shanghai (provincial) testing standard DB31/T 539-2020, Lighting design specification of classroom of middle and primary school and kindergarten, the illumination was measured in a 4m x 1.2m rectangle plane. The rectangle was divided into 30 small squares (0.4m x 0.4m). The illumination for each small square was measured and the illumination uniformity was calculated as the minimum illumination divided by the average illumination.
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