Quartz glass will transmit nearly all of the long and short wave UV, including the germicidal wavelengths, and can be a serious hazard to eyes and skin.
32.
Earlier, household clothes dryers sometimes incorporated a germicidal lamp in series with an ordinary incandescent lamp; the incandescent lamp operated as the ballast for the germicidal lamp.
33.
Earlier, household clothes dryers sometimes incorporated a germicidal lamp in series with an ordinary incandescent lamp; the incandescent lamp operated as the ballast for the germicidal lamp.
34.
By contrast, the hard-UV used in germicidal lamps will not penetrate plastic at all . talk ) 15 : 21, 18 April 2011 ( UTC)
35.
St . Vincent's Hospital and Medical Center in New York has launched a national study to see whether ultraviolet germicidal irradiation and better ventilation will kill TB germs.
36.
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 emerge.
37.
UV at these germicidal wavelengths damage a microorganism's DNA so that it cannot reproduce, making it harmless, ( even though the organism may not be killed ).
38.
The wavelength of emission is tuneable by adjusting the chemistry of the semiconductor material, giving a selectivity to the emission profile of the LED across, and beyond, the germicidal wavelength band.
39.
Other modern applications include semiconductor manufacturing, germicidal processes, polymer surface treatment, high-power CO 2 lasers typically used for welding and metal cutting, pollution control and plasma displays panels.
40.
But germicidal lamps were often commonly used in older days; many parochial schools in the US seemed to have the setup you're describing with a G . L . pointing upwards.
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