Some people say this is one of Surefire's best lights ever made. It is one of the most engineered lights ever made by any company. The A2 Aviator has one bright white incandescent bulb in the center, and 3 low power red LEDs around the edge, to preserve night vision and battery life. The light is rated at 50 lumens, but multiple tests on CPF.com have rated it around 80 lumens, with a very good beam pattern. This light is different from other incandecents because it is digitally regulated, so the light is as bright at full power, all the way through the battery life. Even when the main bulb quits working, the batteries still have about 25% left for the LEDs to use. The tail cap allows for constant on for just LEDs, or both, momentary for LEDs or both, and complete lock out. This light is like new, and is no longer made. It was close to $300 new. I am asking $90.