Fresnel spotlight

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Fresnel spotlight [frā′nel ′spät‚līt]

(electricity)

A lighting instrument that is composed of a lamp and a Fresnel (stepped planoconvex) lens; the unit can be made with or without reflectors and has a system to adjust the spacing between the lamp and the lens so as to control the light beam; models range from 100 to 5000 watts.

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