A lighting device with improved optical performance and efficiency is provided. The lighting device includes a source of energy, a light source, a reflector and a holder. The reflector has a first open end, a second end, and a parabolic profile extending between the first open end and second end. The...http://www.google.se/patents/US20060039139?utm_source=gb-gplus-sharePatent US20060039139 - LED flashlight
