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A Winston cone is a non-imaging light collector in the shape of an off-axis parabola of revolution [1] [2] with a reflective inner surface. It concentrates the light passing through a relatively large entrance aperture through a smaller exit aperture. [ 3 ]
Flashlights using a "total internal reflection" assembly have a transparent optical element (light pipe) to guide light from the source into a beam; no reflector surface is required. For a given size of light source, a larger reflector or lens allows a tighter beam to be produced, while capturing the same fraction of the emitted light.
Changes to the MX-99/U flashlight over the TL-122(D) include an improved, high-impact plastic housing, a plated steel battery spring, improved gasketing (the "U" designation stands for "Underwater"), [4] and a lens reflector deeply into the lens shroud (to reduce light spillover). During the Vietnam era, an improved model was introduced, the MX ...
Ledlenser developed the Advanced Focus System for its flashlights (patented in the USA and Europe). The combination of lens and reflector creates a cone of light with every focus. Another innovation is the mechanical one-hand focusing on the basis of a sliding carriage.
An oblique projection of a focus-balanced parabolic reflector. It is sometimes useful if the centre of mass of a reflector dish coincides with its focus.This allows it to be easily turned so it can be aimed at a moving source of light, such as the Sun in the sky, while its focus, where the target is located, is stationary.
A bicycle reflector appears brighter to the passenger car driver than to the truck driver at the same distance from the vehicle to the reflector. [1] The light beam and the normal axis of the reflector as shown in Figure 2 form the entrance angle. The entrance angle is a function of the orientation of the reflector to the light source.