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Lamp bulb, discharge


Artifact no.
Blue 45
General Electric
Manufactured Date
After 1938
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
This type of lamp used an improved blue fluorescent material, made by heating together calcium oxide or a calcium compound, such as calcium carbonate, which decomposes producing blue light at a lower temperature than was the case with the previously used tungstic oxide.
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/ metallic and black end caps
Artifact Markings
Black lettering on glass reads 'GENERAL/ ELECTRIC/? GE W [logo] W/ BLUE/ 45'
Artifact Missing
Appears complete
Group 1
Lighting Technology
Category 1
Lamp bulbs
60.2 cm