CURVILINEAR TYPE FLUORESCENT LAMP

摘要

A curvilinear type fluorescent lamp comprises a curvilinear, light-transmitting sealed tube made of soda-lime glass or low lead glass containing 12 percent by weight or less of lead oxide, whose softening point is 640 to 720.degree.C and whose coefficient of linear thermal expansion is 92 to 105 x 10-7 cm/cm/.degree.C. On the inner surface of the tube a phosphor layer is formed. The phosphor forming the layer contains a binder consisting chiefly of calcium borate.