An illumination device having an optical waveguide stage to which is optically coupled a light-projecting stage. The illumination device accepts light from a small isotropic light source such as a light emitting diode or a bulb coupled to the optical waveguide stage. The illumination device spreads the...http://www.google.com.au/patents/US8152339?utm_source=gb-gplus-sharePatent US8152339 - Illumination device
