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A 9W germicidal lamp in a modern compact fluorescent lamp form factor Glow of a germicidal lamp excited by a high voltage probe. Close-up of the electrodes and the safety warning. A germicidal lamp (also known as disinfection lamp or sterilizer lamp) is an electric light that produces ultraviolet C (UVC) light.
The location of 'far-UVC' radiation (200-235 nm) in the electromagnetic spectrum. Far-UVC is a type of ultraviolet germicidal irradiation being studied and commercially developed for its combination of pathogen inactivation properties and reduced negative effects on human health when used within exposure guidelines.
Mercury-based lamps operating at low vapor pressure emit UV light at the 253.7 nm line. [68] Ultraviolet light-emitting diode (UV-C LED) lamps emit UV light at selectable wavelengths between 255 and 280 nm. [69] Pulsed-xenon lamps emit UV light across the entire UV spectrum with a peak emission near 230 nm. [70]
The lamp's electrodes are typically made of coiled tungsten and are coated with a mixture of barium, strontium and calcium oxides to improve thermionic emission. A germicidal lamp uses a low-pressure mercury-vapor glow discharge identical to that in a fluorescent lamp, but the uncoated fused quartz envelope allows ultraviolet radiation to transmit.
Ultraviolet germicidal irradiation - UVGI can be used to sterilize air that passes UV lamps via forced air. [21] Air purification UVGI systems can be freestanding units with shielded UV lamps that use a fan to force air past the UV light.
There are various kinds of UV light, all originating from the sun (or from UV light-emitting devices.). Only one type of UV light is likely to be effective in eradicating coronavirus—UVC.
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