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The well-known “daylight” fluorescent lamps are often filled with mercury vapor at low pressure. When an electric current is passed through mercury vapor, an arc discharge and light emitted in the ultraviolet range occur. The luminescent material deposited on the inner surface of the bulb wall emits visible light under the action of ultraviolet radiation. The beatles abbey road i forgot my mask face mask. Depending on the type of luminescent substance, the light can be either pure white or “cool in color” (bluish) or “warm in color” (yellowish).
Depending on the type of luminescent substance, the light can be either a pure white or a cool color. The spectrum of fluorescent lamps is linearly variable and includes several lines in different bands of the spectrum. The efficiency of such lamps reaches tens of percent, in everyday life they are often referred to as cold light.