LED apparatus for illumination toward a preferential side, including a light emitter having at least one LED on a base, a primary lens positioned over the light emitter and having a central axis, and a secondary lens placed with an inner surface surrounding the primary lens. The secondary lens has a...http://www.google.com.au/patents/US7618163?utm_source=gb-gplus-sharePatent US7618163 - Light-directing LED apparatus
