A vehicular lighting assembly is provided that includes a chamber defined by isotropically luminant back and side surfaces, a depth, and a front surface having a lens aperture. The lighting assembly also includes LED sources on the back surface. In addition, each source has a beam angle≧a light exit angle, and is spaced from the other sources≦the depth divided by a predetermined factor between approximately 1.0 and 2.5. In certain aspects, the front surface also includes a diffuser. In other aspects, each source is spaced from the other sources≦the depth divided by a predetermined factor of approximately 2.5 or less.