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Watercraft navigation lights must permit other vessels to determine the type and relative angle of a vessel, and thus decide if there is a danger of collision. In general, sailing vessels are required to carry a green light that shines from dead ahead to 2 points (22 + 1 ⁄ 2 °) abaft [note 1] the beam on the starboard side (the right side from the perspective of someone on board facing ...
The lighting used for reef aquariums is the highest intensity of all aquarium types. Typical light sources types include LED, fluorescent, metal halide, and sometimes plasma lamps. Simple lighting setups use a single lamp or multiple lamps of a single type. More advanced setups can include several lamp types and can also include lamps of ...
Main article: Light-emitting diode physics. In a light-emitting diode, the recombination of electrons and electron holes in a semiconductor produces light (be it infrared, visible or UV), a process called " electroluminescence ". The wavelength of the light depends on the energy band gap of the semiconductors used.
Fishing light attractor. In this video, dozens of 15-18 inch speckled trout are attracted to a 1000 W green light mounted on a pier. A fishing light attractor is a fishing aid that uses lighting devices attached to structure above water or suspended underwater to attract fish at night. This is taking advantage of the phototactic behaviour ...
Forward of them, one on each side of the ship, two smaller emergency boats, 25 ft (7.6 m) long, had a capacity of 40 persons each. Four Engelhardt collapsible lifeboats measuring 27 ft 5 in (8.36 m) long by 8 ft (2.4 m) wide had a capacity of 47 persons each; they had canvas sides, and could be stowed almost flat, taking up a comparatively ...
LED lighting on an ambulance in Toronto. Light-emitting diodes are small, completely solid state, very power-efficient, long-lasting (as they have no filaments to burn out) and can be seen very easily even at great distances and in sunlight. LED emergency lights entered standard use around the 2000s and 2010s, replacing most rotating and strobe ...
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