A light emitting diode module comprising: a circuit substrate; a plurality of LED dies mounted directly in bare chip form on one surface of said circuit substrate and arranged so as to form a series circuit; two field effect transistor dies, mounted directly in bare chip form on said one surface of said circuit substrate. for limiting current flowing through said plurality of LED dies; a dam (12, 20) formed on said circuit substrate so as to enclose an LED block region where said plurality of LED dies are mounted and a circuit block region comprising left and right circuit blocks where said two FET dies are mounted so as to separate said LED block region from said circuit block region comprising left and right circuit blocks, wherein said dam (12, 20) includes a first dam of circular shape enclosing said LED block region and a second dam of rectangular shape, where each of the said left and right circuit blocks of the circuit block region is enclosed by the second dam and a portion of the first dam; a same phosphor containing fluorescent resin (26, 27) for covering said LED block region and said circuit block region; a constant current circuit mounted on said one surface of said circuit substrate and connected in series with said series circuit, wherein said constant current circuit includes one of said two FET dies; and a bypass circuit connected to an intermediate terminal provided on said series circuit, wherein said bypass circuit includes another one of said two FET dies; wherein said circuit block region includes a first region which is arranged on a left side of said LED block region, and a second region which is arranged on a right side of said LED block region. a circuit substrate; a plurality of LED dies mounted directly in bare chip form on one surface of said circuit substrate and arranged so as to form a series circuit; two field effect transistor dies, mounted directly in bare chip form on said one surface of said circuit substrate. for limiting current flowing through said plurality of LED dies; a dam (12, 20) formed on said circuit substrate so as to enclose an LED block region where said plurality of LED dies are mounted and a circuit block region comprising left and right circuit blocks where said two FET dies are mounted so as to separate said LED block region from said circuit block region comprising left and right circuit blocks, wherein said dam (12, 20) includes a first dam of circular shape enclosing said LED block region and a second dam of rectangular shape, where each of the said left and right circuit blocks of the circuit block region is enclosed by the second dam and a portion of the first dam; a same phosphor containing fluorescent resin (26, 27) for covering said LED block region and said circuit block region; a constant current circuit mounted on said one surface of said circuit substrate and connected in series with said series circuit, wherein said constant current circuit includes one of said two FET dies; and a bypass circuit connected to an intermediate terminal provided on said series circuit, wherein said bypass circuit includes another one of said two FET dies; wherein said circuit block region includes a first region which is arranged on a left side of said LED block region, and a second region which is arranged on a right side of said LED block region.