LED bulb with a heat dissapating radiator sized and shaped for replacing existing halogen bulbs

摘要

An LED bulb for replacing a reflect cup shaped halogen bulb which can be used with an existing mounting base of the reflect cup shaped halogen bulb. The LED bulb comprises a shell, a collective lens, an LED circuit board, one or more LEDs arranged on the LED circuit board, a radiator and a driver. The shell has a hollow structure. The LED circuit board is disposed within a cavity of the shell and connected to the radiator. The collective lens is disposed at a lower end portion of the cavity of the shell. The shell, the radiator and the driver are connected to each other from bottom to top in sequence. On a circumferential exterior wall at a lower end of the shell there is a circular ring. The circular ring is removably connected to the shell. The outer diameter and the height of the circular ring are equal to an outer diameter of a reflect cup of the reflect cup shaped halogen bulb and a height of an annular flange of the reflect cup, respectively. The outer diameter of the radiator is less than or equal to a mounting outer diameter of the mounting base. The radiator comprises a first radiator portion and a second radiator portion located under the first radiator portion. An outer diameter D1 of the first radiator portion and an outer diameter D2 of the second radiator portion meet this formula: D2?D1. When the LED bulb is mounted to the mounting base of the reflect cup shaped halogen bulb, a distance from a lower end of the first radiator portion to a bottom face of the mounting base is larger than a height of the mounting base. The outer diameter of the first radiator portion of the radiator is equal to the mounting outer diameter of the mounting base. The radiator is constituted of a central post, a plurality of fins disposed on the circumferential outer wall of the central post in a radiating spaced configuration and a bossing disposed around outsides of said plurality of fins. Each of the fins is constituted by an upper wing and a lower wing integrated with the upper wing, and a width of the upper wing is larger than that of the lower wing. The bossing is disposed at outsides of the upper wings. The upper wings of the plurality of fins and the bossing constitute the first radiator portion of the radiator and the lower wings of the plurality of fins constitute the second radiator portion of the radiator.