... 20mm lens with holder for 1-3W LED 5-200W glass lens for 1-150W Glass & PMMA Materials Name: Led lens ,glass lens,street lamp lens,optical ... : BK7,Borosilicate Glass ,PMMALight Efficiency: >97% (un-coated)Lens type: aspheric lens,spherical lens,special lens for street lamp,underwater lamp and industrial lamp ...