A vehicle lamp has a red bulb which is made by coating its exterior surface with
a red paint including iron oxide as a red pigment. A mean particle size of the
iron oxide is controlled to a range of approximately 10 to 100 nm, and a PWC concentration
of the iron oxide is controlled to a range of approximately 60 to 90%. As a result,
a red marker lamp can have an appropriate luminous flux (12020% lm) and desirable
chromaticity (y<0.335 and z<0.008) and satisfactory heat resistance (350
C. or higher).
