Discharge lamp having interference filter

Details Discharge lamp having interference filter Discharge lamp having interference filter

1992-09-08

1994-02-08

Lazarus, Ira S.

Illumination

Light source and modifier

Ionized gas or vapor light source

362 61, 362293, 359589, F21V 900

Patent

active

052853624

ABSTRACT:
A metal halide lamp device includes a discharge bulb and a light filter. The light filter is constructed such that transmittance of about 436 nm wavelength light-rays passing through the light filter and transmittance of about 546 nm wavelength light-rays passing therethrough are made substantially lower, and transmittance of about 578 nm wavelength light-rays passing therethrough is made substantially high. Due to the provision of the light filter, a bluish color during a starting period of the discharge bulb is transformed into a substantially white color.

REFERENCES:
patent: 2413127 (1946-12-01), Wells
patent: 4940636 (1990-07-01), Brock et al.
patent: 5109181 (1992-04-01), Fischer et al.
patent: 5169224 (1992-12-01), Segoshi et al.

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