Metal halide low-power high-pressure discharge lamp

Details Metal halide low-power high-pressure discharge lamp Metal halide low-power high-pressure discharge lamp

1991-03-04

1993-05-11

Yusko, Donald J.

Electric lamp and discharge devices

With gas or vapor

Having particular electrode structure

313621, H01J 6104

Patent

active

052104630

ABSTRACT:
Low-power, high-pressure discharge lamps, that is lamps having a power rag below and up to about 400 W, have a quartz discharge vessel retaining a metal halide fill which, to obtain a color temperature between 2700.degree. to 3400.degree. C. contains sodium and tin. To prevent deterioration of the electrode head (19; 39; 59), it is formed in essentially cylindrical or frusto-conical outer contour, which has a mass determined by the formula M=i.sub.L .times.(23.+-.8), and is retained on an electrode pin or shaft (17; 38; 58) having a diameter (d) in millimeters ##EQU1## wherein i.sub.L is the effective value of the lamp current in amperes. Preferably, the electrode head (19) extends beyond the end portion of the electrode pin to define a small depression with respect thereto. The particular shape and dimension of the electrode head and the electrode shaft reduces flicker and electrode burning.

REFERENCES:
patent: 4396857 (1983-08-01), Danko
patent: 4633136 (1986-12-01), Fromm et al.
patent: 4717852 (1988-01-01), Dobrusskin et al.
patent: 4724358 (1988-02-01), Inukai
patent: 4851735 (1989-07-01), Gosslar et al.
patent: 4968916 (1990-11-01), Davenport et al.
patent: 5001397 (1991-03-01), der Kindreen
patent: 5004951 (1991-04-01), Honda et al.

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