The present invention relates to a device of the emission of ultraviolet light configured to insolate a photopolymer plate (3), in particular for flexographic printing, comprising a main line (7) of lamps (6) in the form of tubes, are equidistant of ultraviolet light, separated from one another by a space. It comprises a source (8) of ultraviolet light complementary situated outside the plane of said row, the main (7) of lamps (6), said source (8) of ultraviolet light complementary being configured so as to send the beams (10, 11) of ultraviolet light through the spaces (9) between the lamps (6) of said row, the main (7). The present invention also relates to an installation (1) of exposure, comprising a device according to the invention, as well as a method of the exposure of a photopolymer plate (3) using a device according to the invention.
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