Optics and diffusers for PrevaLED Linear 20 mm modules: linear polycarbonate lenses with 30°, 60° and 90° beams (FWHM), and diffusers in 560, 600, 1,150 and 1,450 mm lengths that give an even, glare-free line like a fluorescent tube. They snap on over the M4 mounting-screw heads, with transmission above 82 % — for retail and industrial luminaires.