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.
The new power groove lamps, with grooves on opposite sides, were introduced in 1959. The grooves placed phosphor closer to the centre of the arc stream and "Squeezed: the arc for greater light producing power. Alternating grooves made the arc travel in a wavy path to effectively increase the length and give greater efficiency.
An example of a lamp bulb made and 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 with colourless transparent ends/ metallic and black end caps
Black lettering on glass reads 'GENERAL GE (logo) ELECTRIC/ F48 PG17 CW COOL WHITE/ POWER GROOVE/ MADE IN CANADA 35 4'