Abstract: An ornamental lamp assembly which mounts a diffraction grating in the form of a compact disc about a light socket. The diffraction grating is mounted so as to freely wobble relative to the light socket. A light bulb mounted in the light socket produces light that is reflected by the refraction grating which visually produces a series of different colors that are constantly moving due to the wobbling mounting of the grating on the light socket. The compact disc could include a series of light reflective areas and a series of light transmitting areas.