The invention provides a use of a phosphor composite member, which is disposed on one side of an illuminating surface of an illuminating chip to change the light emitted from the illuminating chip to the light having different wavelengths. The phosphor composite member is made of phosphor composite material fired at low temperatures. The phosphor composite member is the phosphor composite material composed of a glass powder and a phosphor powder, which is characterized in that the glass powder is composed of SnO-P 2 O 5 -B 2 O 3 glass comprising 2-30 mol% B203 and 5-24mol% P205.