When writing desk lamp is in normal working position, the main optical performance requirements have three points
(1) Shading resistance
People in the normal posture of the situation, the eyes to the horizontal direction, should not see the shade of the inner wall and light source;
(2) Desktop illumination requirements
Lamp irradiation should be 250LX-500LX in the work area, minimum illuminance should be ≥ 120LX.
(3) Illuminance uniformity requirements
Should ensure that the work area under the lamp irradiation, the illuminance is relatively uniform, can not produce special light or dark spot, only to ensure that these three points of basic optical performance requirements, can slow the fatigue of the eyes, can be said to be a desk desk lamp.