it is a kind of R series,it can meet ROSH ,NOM,CE,UL and so on .It can last 10000hours,10 times more than ordinary blubs. Item No.DescriptionTube. Dia.Lamp Size(mm)Lumen flux(100h)FY-036 R63 7W E14/E27T3 3U 108x63 210FY-036 R63 9W E14/E27 T3 3U 113x63 280FY-036 R63 11W E14/E27 T3 3U 123x63 350 energy saving lamps