A homogenous light-emitting diode (LED) lamp for an automotive vehicle is provided that includes multiple LEDs configured as a LED array and a diffusion sheet. The diffusion sheet has a curvature aligned with the LED array for smoothing and bending light emitted by the LEDs for the purpose of creating a lighting appearance substantially lacking hotspots. An automotive vehicle lamp for producing homogenous light is provided. The vehicle lamp includes multiple LEDs each positioned a first distance apart from one another to form an array of LEDs, and a diffusion sheet positioned a second distance from the array of LEDs for smoothing light emitted from the array of LEDs. The first distance and the second distance are arranged for the purpose of providing a substantially homogenous light output from the vehicle lamp when viewed through the diffusion sheet.

A lighting device for vehicles includes a light source unit containing numerous light sources, and includes a hologram unit containing numerous hologram segments for generating a predefined light distribution. The hologram segments form reflection hologram segments behind and/or next to the light source unit in the main beam direction (H) of the lighting device, such that light emitted from the light source strikes the reflection hologram segment at an acute angle ). Holographic diffraction information is stored in the reflection hologram segments for generating a signal light distribution. The light source unit contains just one printed circuit board or one printed circuit board substrate.

A vehicle exterior lamp assembly has an optical light transmission device having a first end, a second end opposite the first end and a side wall extending between the first end and the second end. A cover lens covering the second end of the optical light transmission device. One or more primary light sources are configured to input light into the first end of the optical light transmission device for emission as an output from the second end. A hologram is provided on the side wall of the optical light transmission device. A secondary light source is configured to illuminate the hologram to display an image on the side wall of the optical light transmission device.