Teardrop Light 04
Teardrop Light 04 : Optical Types: (2) Rotating Light: The parts and workings of a rotating light: Top The assembled beacon, including an optional mirror to be used when the beacon is placed in the windshield or rear window. Center The beacon, with the mirror removed. Bottom left and right The green dome of the beacon has been removed to show its rotating reflector, incandescent lamp, and electric motor. These revolving lights may contain a single, stationary bulb around which a curved mirror is spun (or which is attached to a spinning mirror), or a lamp with a Fresnel lens. This creates rotating beam (s) of light, appearing to flash when viewed. Larger rotating lights may contain modular or sealed-beam lamps which rotate as an assembly (commonly 2 or 4 bulbs, but possibly 1 or 3). To protect the workings of the beacon, a plastic dome often covers the assembly. These domes usually come in solid colors, but in some cases the front and back halves of the dome are different colors. Other beacons use a clear dome with colored lenses on each lamp. Especially in the last case, these rotating beacons are sometimes referred to colloquially as "gumball machines" or sometimes "cherry tops" in the case of red lights. Rotating lights often use a quartz-halogen or conventional incandescent bulb, though some rotating beacons are now made with LEDs rather than bulbs. Rotating lights may be used in lightbars as well as in single beacons. In a modern enclosed lightbar, generally 'V'- or diamond-shaped mirrors are provided between the lamps to give the effect of multiple flashing lights
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