How long does it take to turn on UV lamp in a clean room?

The cleanroom must be disinfected to ensure its absolute dust-free environment. Using ultraviolet disinfection is one of the most effective ways to keep cleanroom particle-free. How long does it take to turn on/off UV lamp in a clean room? In

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Ultraviolet light can kill almost all the viruses in a room. Why isn't it everywhere? - Vox