Filter: Glass 420,470,530,620,660nm Light source: Tungsten bulb,6v ... analysis . The optical system consist of the Lamp , Hear - absorption filter, Lens and Diaphragm .The light trasferring in the system falls ... ,492,546,578,60nm;or 420,470,530,620,660nm(glass)Wavelength Range 420-660nmPhotoelectric Range T% : 0-100%,ABS:log ...