Written when the lamp is in the normal operating position, there are three main optical performance requirements
Case of a person in a normal sitting position, eyes to the horizontal direction, should see the shade and the light on the inside wall;
(2) desktop illumination requirements
Lamp irradiation 250lx-500lx within the work area, minimum illumination ≥ 120lx.
(3) uniformity of illumination requirements
Within the work area should ensure that exposure to lamp, illumination is relatively uniform, not particularly bright or dark spot, only to ensure that the optical properties of the three basic requirements to reduce eye fatigue, can be called a writing desk lamp.