There are generally four types of light sources for writing desk lamps: incandescent lamps, tungsten halogen lamps, fluorescent lamps and LEDs. The three types of light sources have their own advantages and disadvantages, and different people may like the color and brightness of different light sources, which should be suitable for different people. In order to project most of the light to the desktop, the light source installation position of writing desk lamp is usually horizontal or downward.

When buying a writing desk lamp, besides checking its optical performance, we should also check whether other performances are qualified.

One pull, two tones, three shakes and four touches. "Pull" refers to pulling the plug of the power cord away from the socket, and forcibly pulling the power cord out of the lamp cavity to see if the connection of the power cord is firm. The power cord must not fall off from the lamp cavity. "Adjustment" refers to the adjustment of various working positions of the desk lamp. During adjustment, no sound can be made, and the adjusted working position should be locked conveniently and reliably. "Shake" means to set the desk lamp to the most unfavorable working position, and then gently shake the plane where the desk lamp is placed to see if it is easy to fall over. If the desk lamp is not stable, it is easy to fall over. "Touch" refers to whether the heating parts that are easy to touch when using, such as the lampshade, are hot or not after lighting the desk lamp for a period of time (2 hours) to prevent accidental burns when using in the future.