| 摘要 |
An arrangement and method for providing an elongated light source, such as for illuminating a sign or other display, which includes emitting light from an exterior light source (4) into an inner tube (2) having a portion lined with a high reflectance film of prismatic lenses, the tube having a light-transmissive opening (14) along its length, with a diffusing medium (12) opposite such opening and optionally a reflector (6) at one end of the inner tube. The inner tube (2) is concentrically surrounded by an outer tube (3) having light-transmissive portions of different colors. The emitted light propagates in the inner tube (2) by reflecting from the high reflectance lining and the reflector to impinge on the diffusing medium and thereby transmit light outwardly through the light-transmissive opening and thereafter through a selected one of the colored portions. |
