1. Look at the appearance. Check whether the appearance of the product is damaged, whether the power cord is loosely fixed, whether the lamp base is stable, and the flat lamp inclined at an angle of 6° should not slide or fall over.
2. Look at the shiny side. Products with a round or wider light-emitting surface have a more uniform illuminance distribution.
1. During use, the height of the lamp should be in a normal sitting posture, and it is better not to see the light-emitting surface when looking up.
2. LED reading and writing desk lamps have higher illuminance than traditional lamps, especially in the center of the light-emitting surface. It is recommended that the distance between the working surface and the center of the light-emitting surface be 20-30 cm.