A red automotive incandescent lamp having a sealed lamp envelope formed from
an
amber glass, a pair of filaments located within the lamp envelope, and a red pigmented
coating applied to an external surface of the envelope. The amber glass provides
initial filtering of the shorter wavelengths of visible light, so that the red
pigment has to filter out less light and therefore can be made less opaque. As
a result, the lamp produces the desired red colored light at a total light output
that meets applicable SAE and ECE requirements for automotive lamps.
