The high-pressure mercury lamp is a vapour or gaseous-discharge lamp that uses mercury in an excited state to produce light. The arc discharge takes place in a transparent tube inside a larger glass bulb, the outer bulb reducing the UV radiation of the inner arc tube. Radiation from the mercury arc is confined to four distinct wavelengths in the visible range and several strong lines in the ultraviolet. This lamp is an ideal source for the photoelectric-effect experiment, as well as for many industrial and research applications requiring UV radiation, and is specially designed as a laboratory instrument.

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