Low pressure sodium vapor discharge lamp

Details Low pressure sodium vapor discharge lamp Low pressure sodium vapor discharge lamp

H - Electricity

01

J

313/10

H01J 17/02 (2006.01) H01J 61/35 (2006.01) H01J 61/52 (2006.01)

Patent

CA 1108214

LOW PRESSURE SODIUM VAPOR DISCHARGE LAMP ABSTRACT OF THE DISCLOSURE A low pressure sodium vapor discharge lamp for generating directional light output, the lamp including a cylindrical discharge tube within a cylindrical outer envelope. The outer envelope is provided with a diffuse coating which is highly reflective of visible sodium light and which defines a clear aperture on the outer envelope for the directional escape of visible light. The space between the inner discharge tube and the outer envelope is air filled to provide conductive and convective heat dissipation from the discharge tube. Sodium condensation takes place in a plurality of spaced reservoirs located in the portion of the discharge tube away from the aperture to keep that portion of the discharge tube facing the aperture clear. A heater coil is wound around the inner discharge tube to keep it at a desired standby temperature for lamp use on demand. The lamp filament electrodes are also maintained at standby temperature to improve the illumination profile along the lamp.

303069

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