Lead and arsenic free borosilicate glass and lamp containing same

An electric arc discharge lamp having an arc discharge light source which emits both visible and ultraviolet radiation, the light source being enclosed within an outer envelope comprising a lead and arsenic free borosilicate glass having a composition containing 13.5 to 16.8 weight percent B2O3, 2.0 to 4.0 weight percent Al2O3, 2.0 to 5.0 weight percent Na2O, 1.3 to 4.0 weight percent K2O, from 0 to 0.30 weight percent Li2O, 0 to 2.0 weight percent CaO, 0 to 2.0 weight percent MgO, 0.04 to 0.17 weight percent Fe2O3, 0.005 to 0.12 weight percent CeO2, 0.005 to 0.30 weight percent TiO2, and the balance SiO2, and wherein the sum of the amounts of Fe2O3 and CeO2 comprise no greater than 0.19 weight percent, the sum of CaO and MgO comprise no greater than 2.0 weight percent, and the sum of the amounts of Na2O, K2O and Li2O comprise no greater than 7.5 weight percent.