Light distribution systems include a light emitting portion, a light source for supplying light to the light emitting portion and a power source for the light source. A sealed holder or pocket may be provided for the light emitting portion. The light emitting portion may be located on an upper portion...http://www.google.fr/patents/US5894686?utm_source=gb-gplus-shareBrevet US5894686 - Light distribution/information display systems
