An LED module that includes an LED (light-emitting diode) and a rotationally symmetrical, bowl-shaped collimator lens is provided. The collimator lens has an inner refractive wall, an outer reflective wall, a first surface having an entrance aperture with a recess in which the LED is situated and which...http://www.google.ca/patents/US20020080615?utm_source=gb-gplus-sharePatent US20020080615 - LED collimation optics with improved performance and reduced size
