When the writing desk lamp is in the normal working position, there are three main optical performance requirements.
(1) shading
When the person is in a normal sitting position, the eyes should look in the horizontal direction, and the inner wall of the lampshade and the light source should not be visible;
(2) Desktop illumination requirements
The working area illuminated by the desk lamp should be ≥250lx, and the minimum illuminance should be ≥120lx;
(3) Illumination uniformity requirement
It should be ensured that the illuminance in the working area illuminated by the desk lamp is relatively uniform, and it is not possible to produce a particularly bright or dark spot. Only by ensuring the basic optical performance requirements of these three points can the eye fatigue be alleviated, and it can be called a desk writing lamp.
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