There are generally four types of light sources for writing table lamps: incandescent lamps, tungsten halogen lamps, fluorescent lamps and LEDs. The four types of light sources have their own advantages and disadvantages. Different people may like the light color and brightness of different light sources, which should be suitable for each person. In order to project most of the light onto the desktop, the light source installation position of the writing table lamp is usually horizontal or downward.
When purchasing, in addition to checking its optical properties, it should also check whether other properties are qualified.
One pull, two tune, three shake, four touch.
"Pull": Unplug the power cord from the socket, and pull the power cord out of the lamp cavity to see if the power cord is firmly connected. The power cord must not come out of the lamp cavity.
"Adjust": Adjust the various working positions of the table lamp. When adjusting, no sound can be made. After adjustment, the working position should be easily and reliably locked.
"Shake": Adjust the table lamp to the most unfavorable working position, and then gently shake the placed surface to see if it is easy to overturn.
"Touch": After lighting the table lamp for a period of time (2 hours), touch the lampshade and other heat-generating parts that are easy to touch during use, whether it is hot to prevent accidental burns during future use.