Low-pressure mercury vapor discharge lamp

• Main Author: GEERDINCK LEONIE M.,DE BEER ESTHER,VAN DER POL ADRIANUS J. H. P
• Format: Patent
• Language: English
• Published: 31.05.2006
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS; CHEMISTRY; ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS; ELECTRICITY; GLASS; JOINING GLASS TO GLASS OR OTHER MATERIALS; METALLURGY; MINERAL OR SLAG WOOL; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS; SURFACE TREATMENT OF GLASS

Low-pressure mercury vapor discharge lamp has an at least partly substantially cylindrical discharge vessel ( 10 ) with a length Ldv and with an internal diameter Din. The discharge vessel ( 10 ) encloses, in a gastight manner, a discharge space ( 13 ) provided with a inert gas mixture and with mercury. The discharge vessel ( 10 ) comprises discharge means (electrodes 20 a; 20 b) for maintaining a discharge in the discharge space ( 13 ). According to the invention, the ratio of the weight of mercury mHg in the discharge vessel ( 10 ) to the product of the internal diameter Din and the length of the discharge vessel Ldv is given by the relation: Formula (I), wherein C<=0.01 muG/MM2. Preferably, 0.0005<=C<=0.005 muG/MM2. Preferably, the discharge vessel ( 10 ) contains less than 0.1 mg mercury. The discharge lamp according to the invention operates under unsaturated mercury conditions. m Hg D in x L dv = C ( 1 )