High intensity discharge lamp with ultra violet absorbing envelo

Details High intensity discharge lamp with ultra violet absorbing envelo High intensity discharge lamp with ultra violet absorbing envelo

1995-06-15

1996-09-17

O'Shea, Sandra L.

Electric lamp and discharge devices

With gas or vapor

Envelope composition

313112, 501 66, 501 70, 501905, 428 344, H01J 1716, H01J 6130

Patent

active

055571719

ABSTRACT:
An electric arc discharge lamp has an arc discharge light source which emits both visible light radiation and UV radiation enclosed within a borosilicate, outer glass envelope. The envelope has a transmission of greater than 90% at a wavelength of 425 nm and a transmission of not more than 40% of UV radiation at 320 nm; 8% of UV radiation at 300 nm; and 0.5% of UV radiation at 290 nm. The borosilicate glass comprises, in weight percent: from about 3.89% Na.sub.2 O; about 1.5% K.sub.2 O; from 0.0% to about 0.15% Li.sub.2 O; about 17% B.sub.2 O.sub.3 ; about 1.4% Al.sub.2 O.sub.3 ; about 0.6% CaO; about 0.35% MgO; about 0.13% Fe.sub.2 O.sub.3 ; and the balance SiO.sub.2.

REFERENCES:
patent: 4310773 (1982-01-01), Zukowski et al.
patent: 4684847 (1987-08-01), Spierings et al.
patent: 5350972 (1994-09-01), Bucher et al.
patent: 5391523 (1995-02-01), Marlor
patent: 5412280 (1995-05-01), Scott et al.

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