A device used to provide illumination by means of an electric current which excites mercury vapor in a glass tube, producing short-wave ultraviolet light that then creates fluorescence, producing visible light.
High Output bulbs, developed in 1954, produced on-third more light than any previous lamp, without the higher wattage consumption. This type of lamp increased illumination levels in areas with limited numbers of lighting units or where lamps operated in lower temperatures. With the higher brightness, extra shielding and ventilation were required.
An example of a lamp bulb used in Canada, part of a large and varied collection of over 7500 electrical items acquired and documented by Ontario Hydro in the 1960s. The collection was thought to be the largest and most comprehensive of its kind in Canada and was donated to the Canada Science and Technology Museum in 1992
Glass tube coated with white phosphor/ metal parts/ synthetic parts
Number of Parts
White tube/ metallic and black end caps
Black lettering on glass reads 'WESTINGHOUSE/ 48T12 COOL WHITE/ 96/ W [logo] / HIGH OUTPUT/ F48T12/CW/HO'