Electronic Ballast Magnifying lamp 1.lens material:glass, lens sizes 3.5" 2.Diopter:3 and 8 Electronic Ballast Magnifying lamp1.lens material:glass, lens sizes 3.5"2.Diopter:3 and 83.Light source:110V-120V/220V-240V 11W energy saving.4.Color availabe:white, black,light grey. Electronic Ballast Magnifying lamp