Best Deal UV D200 Air Purifier Whole House Uv Light in Duct for Hvac Ac (Air Conditioning) Duct Germicidal Filter ORIGINAL OEM D200 MODEL BY BEST DEAL UV All our units have an electronic ballast and a sight glass to see if unit is on. All Our bulbs are germicidal UVC and put out 253.7NM Easy to install! ALL OUR PRODUCTS ARE OZONE FREE