Abstract: A light fixture for fixing to a building or building surface has a trough-shaped reflector having first and second side walls forming a light outlet and a reflective inner surface, each of the side walls having a planar section. A diffuser is mounted on the outlet. A plurality of LED's of different colors on the planar sections are positioned such that a predominant portion of the light emitted by the LED's on one of the side walls only reaches the diffuser element after reflection off the other side wall.