Low-pressure mercury vapour discharge lamp

Details Low-pressure mercury vapour discharge lamp Low-pressure mercury vapour discharge lamp

H - Electricity

01

J

313/81

H01J 1/63 (2006.01) C09K 11/66 (2006.01) C09K 11/77 (2006.01) H01J 61/44 (2006.01) H01J 61/72 (2006.01)

Patent

CA 1096923

PHN. 8875C. ABSTRACT Low-pressure mercury vapour discharge lamps provided with a luminescent layer, the power consumed being relatively high. Lamps are provided being loaded by at least 500 W per m2 surface area of the luminescent layer. Furthermore lamps are provided having a nominal length of 60 to 150 cm and consuming a nominal power of 0.25 to 0.50 W per cm length of the discharge tube. The luminescent layer contains a luminescent material which has the property of having at 254 nm-excitation a luminous flux which, after the material has been subjected for 15 minutes to ultraviolet radiation of a wavelength of mainly 185 and 254 nm and a radiation density between 150 and 500 W/m2 and a ratio of 185 nm power to 254 nm power between 0.20 and 0.40, is not more than 5% lower than the initial luminous flux of the material also at 254 nm excitation and measured under identical circumstances. The combination of cations in the luminescent material has an electronegativity of not more than 1.4.

289983

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