UV Light for water filtration,has many specifications. The lamps are from China domestic or Phillip. YUNDA FILTER CO. is a professional manufacturer of all kinds of water filters and element such as filter housing, filter cartridge, connector, valve, faucet, UV light, FRP,etc.UV Light for water filtration:specifications as follows:Length:10inch~40inchWatt:4~55wVolt:110v/220v UV Light