This invention concerns a light diffuser for lighting equipments which is made up of a front plate (14) with holes or openings (16) distributed uniformly over all its surface, and an internal sheet (15) associated with the internal surface of the front plate and having holes of a different diameter (17, 17', 17'') along different parts of its length and each positioned in line with an opening in the front plate. The front plate and the internal sheet may be two associated bodies or form a single integrated body.