1.Made from precious metal oxide. 2.Infrared Wavelength scope:3u~ 15u(micron). 3.Long service life: 10,000 hours. Model no.Effective length(mm)Full length(mm)Voltage(V)Wattage(W)PH-300300 x 60350220 / 380600PH-400400 x 60450220 / 380800PH-500500 x 60550220 / 3801000PH-600600 x...