The purchasing skills of bedroom lamps

The light sources of writing desk lamps generally fall into four categories: incandescent lamp, halogen tungsten lamp, fluorescent lamp and LED. Each of the four types of light sources has its advantages and disadvantages. Different people may like the light color and brightness of different light sources, which should be appropriate for each person. In order to project most of the light onto the desktop, the light source of the writing desk lamp is usually installed horizontally or downward.
When purchasing the writing desk lamp, in addition to checking its optical performance, it should also check whether other performances are qualified.
One pull, two tunes, three shakes and four touch.
"Pull": pull the power cord plug out of the socket, and pull the power cord out of the lamp chamber to see if the power cord is firmly connected. The power cord must not fall out of the lamp cavity.
"Adjustment": 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": Turn the table lamp to the most unfavorable working position, and then gently shake the plane on which the table lamp is placed to see if it is easy to overturn. If the table lamp is not stable, it is easy to overturn.
"Touch": After the lamp is lit for a period of time (2 hours), touch the lampshade and other heating parts that are easy to touch during use to see if they are hot, so as to prevent accidental burns in the future.