Patent ID: 7977262

Claim:
A glass composition for a lamp which contains Ce ions as a component, the glass composition for a lamp consisting of the following that is expressed in terms of oxides: SiO 2 : 55 to 75 wt %, B 2 O 3 : 6 to 25 wt %, CeO 2 : 0.01 to 5 wt %, SnO: 0.01 to 5 wt %, Al 2 O 3 : 0 to 10 wt %, Li 2 O: 0 to 10 wt %, Na 2 O: 0 to 10 wt %, K 2 O: 0 to 10 wt %, MgO: 0 to 5 wt %, CaO: 0 to 10 wt %, SrO: 0 to 10 wt %, BaO: 0 to 10 wt %, TiO 2 : 0 to 1.0 wt %, Fe 2 O 3 : 0.01 to 0.2 wt %, Sb 2 O 3 : 0 to 5 wt %, and ZrO 2 : 0.01 to 5 wt %.