Patent ID: 8093793

Claim:
A fluorescent lamp made of glass, comprising: 55.0-75.0 weight % of SiO 2 ; 10.0-25.0 weight % of B 2 O 3 ; 1.0-10.0 weight % of Al 2 O 3 ; 0-3.8 weight % of Na 2 O; 0-3.0 weight % of Li 2 O; 3.0-10.0 weight % of K 2 O; 3.2-16.0 weight % of Na 2 O+Li 2 O+K 2 O; 0.5-8.0 weight % of TiO 2 ; 0.1-5.0 weight % of CeO 2 ; 0.6-8.1 weight % of TiO 2 +CeO 2 ; and 0.5-10.0% of an oxide of at least one rare earth element selected from the group consisting of Gd, Y, La, Yb and Lu as calculated as an oxide Ln 2 O 3 (Ln: rare earth element), wherein the coefficient of linear expansion of the glass in a temperature range of 30-380° C. is 34×10 −7 /° C. to 58×10 −7 /° C.