A side-emitting lens for use with an LED lamp provides a distribution of emitted light that is substantially normal to an axis of symmetry of the lens; the light can also be symmetrical with respect to a plane normal to the lens axis. The lens has a cavity in which the LED lamp can reside, having a cavity...http://www.google.com/patents/US7703950?utm_source=gb-gplus-sharePatent US7703950 - Side-emitting lens for LED lamp
