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  2. AOL Mail

    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  3. Emergency vehicle lighting - Wikipedia

    en.wikipedia.org/wiki/Emergency_vehicle_lighting

    The four bulb Beacon Ray Model 175 with a clear dome and colored lenses over the bulbs were used extensively in the 1960s by the NYPD with two red bulbs alternated with a white bulb and an amber bulb canted upwards at a 45-degree angle so the amber flash would reflect off upper-floor building windows for added traffic attention/visibility.

  4. Stack light - Wikipedia

    en.wikipedia.org/wiki/Stack_light

    Stack light in automated production for in-line quality inspection. Stack lights (also known as signal tower lights, indicator lights, andon lights, warning lights, industrial signal lights, or tower lights) are commonly used on equipment in industrial manufacturing and process control environments to provide visual and audible indicators of a machine's status to machine operators, technicians ...

  5. Strobe light - Wikipedia

    en.wikipedia.org/wiki/Strobe_light

    These lenses come in a variant of colors, mainly clear, yellow, amber, red, blue, and green. The lens color can affect the intensity of light. [5] LED strobe beacons consist of a base, a LED or group of LEDs, and a cover. A solid state flash controller is located within the base, which allows the LED beacon to operate in a variety of flash ...

  6. Light-emitting diode - Wikipedia

    en.wikipedia.org/wiki/Light-emitting_diode

    The first LED was created by Soviet inventor Oleg Losev [9] in 1927, but electroluminescence was already known for 20 years, and relied on a diode made of silicon carbide. ...

  7. Aviation obstruction lighting - Wikipedia

    en.wikipedia.org/wiki/Aviation_obstruction_lighting

    Aircraft warning lights at the Mannheim telecommunications tower, in the background the bright torchlight of a steam cracker, in the distance warning lights from wind turbines Structure using a white strobe Structure using a Red/White Strobe Closeup of an aircraft warning light on top of a highrise in Changzhou, China Closeup of an aircraft warning light on top a factory facilities Structure ...

  8. Anti-collision light - Wikipedia

    en.wikipedia.org/wiki/Anti-collision_light

    Anti-collision lights, also called beacon lights or strobe lights, are a set of lights required on every aircraft to improve visibility to others, as well as collision avoidance measures by warning other pilots. [1] Historically they have used incandescent light bulbs, but recently LED lamps have been used.

  9. Emergency locator beacon - Wikipedia

    en.wikipedia.org/wiki/Emergency_locator_beacon

    An emergency locator beacon is a radio beacon, a portable battery powered radio transmitter, used to locate airplanes, vessels, and persons in distress and in need of immediate rescue. Various types of emergency locator beacons are carried by aircraft, ships, vehicles, hikers and cross-country skiers.