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  2. Light fixture - Wikipedia

    en.wikipedia.org/wiki/Light_fixture

    Ceiling fans with built-in lights may eliminate the need for separate overhead light fixtures in a room, and light kits can also replace any ceiling-mounted light fixtures that were displaced by the installation of the ceiling fan. Emergency lighting or exit sign – connected to a battery backup or to an electric circuit that has emergency ...

  3. PEL sector light - Wikipedia

    en.wikipedia.org/wiki/PEL_sector_light

    A large PEL sector light installation at the Port of Durban Original Porirua Harbour PEL The PEL sector light is a projector style marine beacon which is used to guide maritime vessels. It does this by projecting a colored sector out to sea with very sharp color changes as the mariner transitions from one sector to the next.

  4. Courtesy lights - Wikipedia

    en.wikipedia.org/wiki/Courtesy_lights

    A vehicle lawfully displaying courtesy lights is not an emergency response vehicle. In most states, vehicles displaying courtesy lights must still stop at stop signs, red lights, etc. and may not speed or disobey any traffic regulations. [1] Usually, violation ticket fines are increased if the ticketed car was flashing courtesy lights.

  5. Deck prism - Wikipedia

    en.wikipedia.org/wiki/Deck_prism

    Before electricity, light below a vessel's deck was provided by candles, oil and kerosene lamps—all dangerous aboard a wooden ship. The deck prism laid flush into the deck, the glass prism refracted and dispersed natural light into the space below from a small deck opening without weakening the planks or becoming a fire hazard.

  6. Light characteristic - Wikipedia

    en.wikipedia.org/wiki/Light_characteristic

    A Morse code light is light in which appearances of light of two clearly different durations (dots and dashes) are grouped to represent a character or characters in the Morse Code. For example, "Mo(A)" is a light in which in each period light is shown for a short period (dot) followed by a long period (dash), the Morse Code for "A".

  7. Navigational aid - Wikipedia

    en.wikipedia.org/wiki/Navigational_aid

    Customarily, the upper mark is up-hill from the lower (forward) mark. The mariner will know the geometry of the marks/lights from the navigational chart and can understand that when "open" (not one above the other) the ship needs to be navigated to "close" the marks (so one is above the other) and be in the preferred line of the channel.

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