Searchlight
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A searchlight is an apparatus that combines an extremely bright source with a mirrored parabolic reflector to project a powerful beam of light of approximately parallel rays in a particular direction.
ATS officers-in-training crew a 90 cm searchlight in Western Command, 1944
Russian troops use a searchlight against a Japanese night attack during the Russo-Japanese War, 1904
Helicopter utilizing its searchlight.
American searchlight crew and equipment in France during WWI
Arc lamp
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An arc lamp or arc light is a lamp that produces light by an electric arc.
Searchlight
…A searchlight (or spotlight) is an apparatus that combines an extremely bright source (traditionally a carbon arc lamp) with a mirrored parabolic reflector to project a powerful beam of light of approximately parallel rays in a particular direction. It is usually…
The 15 kW xenon short-arc lamp used in the IMAX projection system.
A mercury arc lamp from a fluorescence microscope.
A krypton long arc lamp (top) is shown above a xenon flashtube. The two lamps, used for laser pumping, are very different in the shape of the electrodes, in particular, the cathode (on the left).
A krypton arc lamp during operation.