Abstract: A vehicle includes at least one tail light, a rear license plate to be illuminated, and a light source for emitting a light beam to an optical waveguide disposed adjacent the light source. The optical waveguide has an input surface facing towards the light source for inputting at least part of the light beam from the light source, as well as with at least one output surface for outputting a light beam that is being passed through the optical waveguide to the license plate and/or the at least one tail light. The light source may be a light emitting diode.

Abstract: The electric lamp employs a lamp vessel (1), which is transparent to visible light and which accommodates a light source (2). The lamp vessel (1) is covered with a combination of a light-absorbing medium (6) and an optical interference film (5) employing layers of alternately a first layer of a material with a comparatively high refractive index and a second layer of silicon dioxide. A spectral transmission T of light transmitted by the light-absorbing medium (6) changes from T≦0.15 to T≧0.75 in a wavelength range having a width &lgr;≦50 nm. The variation in reflection R amounts to less than 10% in the wavelength range 400≦R≦690 nm, the reflection R and lies in the range 50≦R≦90%. In operation, the electric lamp emits colored light in the transmission mode and has a substantially color-neutral appearance in the off state.

Abstract: The electric lamp comprises a lamp vessel (1) which is transparent to visible light and which accommodates a light source (2). The lamp vessel (1) is covered with a combination of a light-absorbing medium (6) and an optical interference film (5) comprising layers of alternately a first layer of a material with a comparatively high refractive index and a second layer of silicon dioxide. According to the invention, the spectral transmission T of light transmitted by the light-absorbing medium (6) changes from T≦0.15 to T≧0.75 in a wavelength range having a width &lgr;≦50 nm. Preferably, the variation in reflection R amounts to less than 10% in the wavelength range 400≦R≦690 nm. Preferably, the reflection R lies in the range 50≦R≦90%. In operation, the electric lamp according to the invention emits colored light in the transmission mode and has a substantially color-neutral appearance in the off state.