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Lamp bulb, discharge


Artifact no.
4500 White
General Electric
Manufactured Date
Before 1949
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
An example of an early type of flourescent light. Before 1949 the Standard Cool White was called 4500 Degrees White to designate colour temperature in degrees Kelvin of a theoretical thermal radiator whose colour is an approximate visual match to the fluorescent lamp.
Context Canada
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
Artifact Finish
White tube/ gold and black end caps
Artifact Markings
Partially illegible black lettering on glass reads 'GENERAL ELECTRIC/ 15 GE [logo] W/ 4500' and possibly WHITE'
Artifact Missing
Appears complete
Group 1
Lighting Technology
Category 1
Lamp bulbs
45.0 cm