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Manufacturing of a blended lamp (4:44)
In this video from the turning of the century, the assembly and testing of a blended
lamp is shown. A blended lamp combined a mercury vapour arc discharge lamp and
its ballast in the form of a filament, mounted in the same bulb. Due to this
combination, a blended lamp not only emitted ultraviolet radiation but also light and
infrared radiation in a combination that very much resembled that of natural sunlight.
Thanks to this characteristic, blended lamps were applicable for both ultraviolet- and