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Lamp bulb, discharge


Artifact no.
F40-CW Cool White Preheat Rapid Start 24
General Electric
Manufacturer Location
Manufactured Date
After 1952
Context Function
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.
Context Technical
The Rapid start bulb started quickly and smoothly within one second after being turned on. The new design eliminated blinking and flickering of the light. Rapid Start bulbs were covered with a coating called Dri-Film that improved their illumination in humid conditions.
Context Canada
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/ Synthetic sheath with rubber? end pieces
Number of Parts
Artifact Finish
White tube with small section of colourless transparent glass at each end/ metallic and black end caps/ colourless transparent synthetic sheath with rubber or synthetic end pieces
Artifact Markings
Black lettering on glass reads 'GENERAL GE [logo] ELECTRIC/ F40-CW COOL WHITE/ PREHEAT - RAPID START/ MADE IN CANADA 24'
Artifact Missing
Appears complete
Group 1
Lighting Technology
Category 1
Lamp bulbs
glass->;metal->;synthetic->;resin - possible->rubber - possible
121.0 cm