Patent ID: 6552489
Filing Date: 2003-04-22
Classification: C03B,C03C,H01J

Abstract:
A fluorescent lamp comprising:a light-transmitting glass tube having a softening temperature of about 685 degrees centigrade or less, not substantially including lead (Pb), and including: sodium oxide (Na2O) about 1 to about 11 weight %, potassium oxide (K2O) about 1 to about 10 weight %, lithium oxide (Li2O) 0 to about 3 weight %, wherein the total amount of sodium oxide (Na2O), potassium oxide (K2O), and lithium oxide (Li2O) is about 5 to about 20 weight %, and antimony oxide (Sb2O3) about 0.1 to about 0.5 weight %; and a stem, having an electrode, arranged at each end of the light-transmitting glass tube, wherein the lamp current density, which is the ratio of the lamp current to the cross-sectional area of the glass tube, is about 200 mA/cm2 or more.