Here’s an ad from the December 9 1929 edition of the Toronto Daily Star for an ultraviolet lamp that was advertised as providing artificial sunshine.
This blog has encountered the Chas. A. Branston, Ltd. company before: a 1920 ad encouraged people to use a Model 25 or Model 29 Branston ozone generator to fight off influenza.
The company was listed as late as the 1957 Toronto city directory as a manufacturer of electrical appliances; in the 1960 directory, they repositioned themselves as selling records, televisions and radios. They are not listed in the 1965 directory.
By the way, modern sun lamps emit fluorescent light with the UV wavelengths screened out, as they are considered harmful.