Lenses and certain fabrication techniques are described. A wide-emitting lens refracts light emitted by an LED die to cause a peak intensity to occur within 50-80 degrees off the center axis and an intensity along the center axis to be between 5% and 33% of the peak intensity. The lens is particularly...http://www.google.ca/patents/US7352011?utm_source=gb-gplus-sharePatent US7352011 - Wide emitting lens for LED useful for backlighting
