Electric lamp having a coloured lamp envelope

Details Electric lamp having a coloured lamp envelope Electric lamp having a coloured lamp envelope

H - Electricity

01

K

313/136

H01K 1/32 (2006.01) H01J 61/40 (2006.01)

Patent

CA 1222017

ABSTRACT: 7 The lamp envelope of the electric is coated at the inner surface with an electrostatically applied light-scattering pigmented powder layer. The powder layer comprises at least a cadmium-containing pigment and further a cadmium-free pigment. Although cadmium-free pigments alone cannot give lamps the desired colour properties, it has been found that they are capable of replacing cadmium- containing pigments in the powder layer up to a high per- centage by weight.

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