Blue Osram lamp with box

PART OF:
The Bob
Made:
1939-1945 in England
maker:
Osram
Osram lamp, blue, with box.

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Osram lamp, blue, with box.
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Osram lamp, blue, in box. Marked with 'the property of the war department'.

Part of the Bob Gray collection of electrical objects.

This incandescent electric lamp with heavy blue shielding was produced for use during black-out conditions, 1939 - 1945. Blue light penetrates less far into the atmosphere than red and yellow light. These bulbs were therefore used where street lights were banned and inside lighting was not allowed to be visible from the outside. The lamp is marked as property of the war department so was likely produced as part of a contract for military use. The small clear circle at the bottom of the lamp is designed to allow a small amount of clear light to radiate downwards.

Details

Category:
Lighting
Object Number:
Y2012.15.25
Materials:
glass, metal (unknown) and cardboard
Measurements:
Overall: 105 mm x 65 mm, 65 mm, 5 g
type:
incandescent electric lamp
credit:
Mr Robert Gray