Upper room Air UVGI (germicidal ultraviolet) systems consist of luminaires with lamps installed that emit light in the UV-C range (100–290 nm; typically at 254 nm generated by low-pressure mercury vapour lamps). Most luminaires are designed with louvres that limit the light to a narrow region and are installed in the upper part of the room. These systems are designed to focus the UV-C light in the upper part of the room, thus inactivating airborne infectious agents that reach the lighted zone. The lower part of the room is kept relatively UV-C free, minimizing exposure to persons in the lower part of the room. Inactivation in this context means the loss of the ability to replicate and form colonies.
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