Metal vapor lamp having internal means promoting condensate...

Details Metal vapor lamp having internal means promoting condensate... Metal vapor lamp having internal means promoting condensate...

H - Electricity

01

J

313/138

H01J 61/18 (2006.01) H01J 61/35 (2006.01)

Patent

CA 1165375

LD 7993 METAL VAPOR LAMP HAVING INTERNAL MEANS PROMOTING CONDENSATE FILM FORMATION ABSTRACT In a high intensity metal halide discharge lamp, means are provided associated with the interior surface of the envelope to promote thy formation and spreading of a liquid film of condensate thereon. Such a film can lower the color temperature as a result of pressure broadening and self-reversal of the sodium line, and also by acting as a color correcting filter. The film- promoting means may be a coating which imparts an ir- regularity to the surface such that the reduction in exposed surface area by coverage with a uniform liquid film is energetically favored. Alternatively, a chemi- cally different surface better wetted by the metal halide dose may be used.

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