... China.most of our uv lamps and uv ballasts are used for air purification, water treatment systems aquarium sterilizing, etc. Features ... , schools, offices, rooms, etc.Fume Purification system;Home appliances;Aquarium sterilizing systems; Advantages:all our Uv ballasts are produced by ... ourselves to match the relative uv lamps and guarantee the stable quality;Quartz glass sleeves are ...