High intensity discharge lamp with ultraviolet absorbing...

Details High intensity discharge lamp with ultraviolet absorbing... High intensity discharge lamp with ultraviolet absorbing...

H - Electricity

01

J

H01J 61/30 (2006.01) C03C 3/091 (2006.01) C03C 3/093 (2006.01) C03C 4/08 (2006.01)

Patent

CA 2178852

An electric arc discharge lamp having an arc discharge light source which emits both visible light radiation and UV radiation enclosed within a borosilicate glass envelope having a transmission of greater than 90% at a wavelength of 425 nm and a transmission of not more than 40% of said UV radiation at 320 nm; 8% of said UV radiation at 300 nm; and 0.5% of said UV radiation at 290 nm; said borosilicate glass comprising, in weight percent: from about 3.89% Na2O; about 1.5% K2O; from 0.0% to about 0.15% Li2O; about 17% B2O3; about 1.4% Al2O3; about 0.6% CaO; about 0.35% MgO; about 0.13% Fe2O3; and the balance SiO2.

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