China LED household germicidal light can only be used to disinfect the air in unmanned spaces. It cannot be used to irradiate indoor people with direct violet light, because it will cause harm to people (such as electro-optical eyes, skin burns, fine spots, etc.). During the "SARS" period, there were frequent incidents of UV lamp injury in various places, most of which were caused by the improper use of UV lamps in human spaces. Therefore, when using direct ultraviolet light for disinfection, it should be turned on for 0.5~2h beforehand, and people can enter the room after turning off the light. Direct ultraviolet lamps can only disinfect unmanned spaces. Generally, ordinary hot cathode low-mercury lamps are used with quartz glass lamps with high ultraviolet transmittance; some products allow a certain amount of ozone to be used for disinfection, but because Ozone can cause headache, chest tightness, dizziness and other symptoms. Therefore, when the lights are turned off, the doors and windows should be opened for ventilation for 30-60 minutes. After the ozone smell is no longer allowed, the personnel are allowed to enter the room to work.

 
China LED household germicidal light has mobile type and fixed type. When using mobile lamps, a dedicated person should be responsible to ensure safety. During fixed installation, there should be obvious differences between the control switch and the lighting switch, and warning signs should be used; the design drawing should indicate that it is strictly forbidden to install in parallel with the lighting switch. In the Tanghai Hospital project, the ultraviolet light switch is designed to be 18m above the ground; outdoors; A red warning light is installed above the door frame to prevent unauthorized persons from entering. In the classrooms of middle and elementary schools, it is best to centralize the control in the duty room.
 
China LED household germicidal light has a simple structure, low cost, and good disinfection effect. Generally, it will not cause chemical or high temperature damage to the disinfected object, and its advantages are very obvious. However, because it can only be used for static disinfection in unmanned spaces, its application range is limited, and it is mostly used for static disinfection of frequently polluted spaces in hospitals and other places. Direct UV disinfection lamps require a power of more than or equal to 1.5W per cubic meter of indoor air. We can determine the number according to the power of the UV disinfection lamp.