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2. Fresnel lens - Wikipedia

   en.wikipedia.org/wiki/Fresnel_lens

   A non-imaging spot Fresnel lens uses ring-shaped segments with cross sections that are straight lines rather than circular arcs. Such a lens can focus light on a small spot, but does not produce a sharp image. These lenses have application in solar power, such as focusing sunlight on a solar panel.

3. Lighthouses on Lundy - Wikipedia

   en.wikipedia.org/wiki/Lighthouses_on_Lundy

   The North lighthouse was further modernised in 1991 and converted to solar power; in place of the light in the tower a small rotating lantern (an 'Orga Rml 302 SA rotating beacon with 6 position lampchanger') was mounted on top of the old fog horn building, producing a quick white flash every 15 seconds. [7]

4. VRB-25 - Wikipedia

   en.wikipedia.org/wiki/VRB-25

   In at least one case, a VLB-44 was removed and returned to a VRB-25 in 2022 at Whaleback Light to maintain the rotating light signature. [ 7 ] From the first use of lighthouses with flashing lights, the light source has been continuous, because turning a flame on and off is impractical and flashing an incandescent electric lamp reduces its life ...

5. Point Stephens Light - Wikipedia

   en.wikipedia.org/wiki/Point_Stephens_Light

   In 1973, the lighthouse keeper was replaced by automated system powered by solar. [9] There three lighthouse families living there were two month supply of food and barge called Bomb Snow in case they would cut off due to rough seas. [9] In 1990, b following a 1989 failure of the submarine cable and problems with the diesel generator, the light ...

6. American Shoal Light - Wikipedia

   en.wikipedia.org/wiki/American_Shoal_Light

   The light was automated in 1963, and a fourth-order lens with solar-powered light was installed, the current (non-operational) light is a VRB-25 aerobeacon. The light had a nominal range of 14 nautical miles (26 km; 16 mi) in the white sectors, and 10 nautical miles (19 km; 12 mi) in the red sectors.

7. Lighthouse - Wikipedia

   en.wikipedia.org/wiki/Lighthouse

   The remaining modern lighthouses are usually illuminated by a single stationary flashing light powered by solar-charged batteries and mounted on a steel skeleton tower. [23] Where the power requirement is too great for solar power alone, cycle charging of the battery by a Diesel generator is provided. The generator only comes into use when the ...