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A microprocessor controlled 12 volt DC motor drives an array of six or eight acrylic Fresnel lenses around a bulb at one of 248 speeds ranging from 0.5 to 15.9 revolutions per minute (RPM). In the simplest case, all six lenses are used, so that for Boon Island Light , which shows one flash every five seconds, the mechanism rotates at two RPM.
Green flashing beacons can be used by doctors (registered with the General Medical Council). [91] Many doctors now either volunteer or are employed as first responders for ambulance services and their vehicles will carry the, usually blue, lights used by the service or both blue and green to indicate their profession. [92]
The current light source is a modern FA-251 Beacon with a 12 Volt 75 Watt HL-2000 quartz halogen lamp. It is fed by mains electricity with a Battery standby. [3] It revolves once every 30 seconds. [2] The current light characteristic is a flash every five seconds, red to east and white to other directions (Fl.W.R. 5s). It is partially obscured. [4]
LED lights are used for flashing beacon lights on vehicles such as maintenance trucks. [139] Previously, traditional light sources required the engine to continue running to ensure that the battery would not become depleted if the lights were to be used for more than a few hours.
An aerobeacon is a light assembly used to create a fixed or flashing signal visible over long distances. It consists of a high intensity electric lamp mounted with a focusing device in a cylindrical housing, which usually is rotated on a vertical axis by an electric motor. The sweep of the narrow beam thus produced gives the flashing effect.
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