Sun-Kraft Ultraviolet Ray Health Lamp

The Sun-Kraft Wireless Cold-Quartz Ultraviolet Ray Health Lamp is a cold quartz mercury-vapour lamp, originally sold by the Sun-Kraft Corporation for use in ultraviolet light therapy (which you certainly could've figured out from the name of the product). Bathing in the radiation of the Sun-Kraft UV lamp was promoted as a treatment for "head colds, discomfort caused by sinus pains, rheumatism, arthritis, and neuritis," in addition to "clearing up skin ailments, such as eczema, acne, athlete's foot, and ring worm," and promoting healthy skin and hair.

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 * Promotional video, At the End of the Rainbow, in two parts: https://archive.org/details/AttheEnd1946 - https://archive.org/details/AttheEnd1946_2