Illumination system having a low-power high-pressure discharge l

Details Illumination system having a low-power high-pressure discharge l Illumination system having a low-power high-pressure discharge l

1989-12-15

1991-05-21

Mis, David

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch in the primary circuit of the supply...

315 82, 315220, 315326, 315DIG7, 313572, H05B 4100

Patent

active

050178393

ABSTRACT:
To shorten the time between firing of a high-pressure discharge lamp and stantial light output therefrom, the discharge lamp includes a fill of xenon, at a cold fill pressure of at least 3 bar, in addition to mercury and a metal halide; the discharge vessel (2) is, at least in part, coated or doped so that invisible radiation is reflected into the lamp, or absorbed, while visible radiation is being transmitted by the discharge vessel. The shafts of the electrodes are thin, of only about 0.3 mm diameter, and the electrodes facing each other are part-spherical or rounded. The lamp is operated in combination with a lamp power supply (S) which has the characteristics of being capable of supplying between 5 to 10 times normal operating current of the lamp under starting conditions.

REFERENCES:
patent: 4717852 (1988-01-01), Dobrusskin et al.
patent: 4757236 (1988-07-01), Dakin et al.
patent: 4891555 (1990-01-01), Ahlgren et al.
patent: 4935668 (1990-06-01), Hausler et al.

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