Patent ID: 7708440
Filing Date: 2010-05-04
Classification: F21S,F21V

Abstract:
1. A lighting system comprising an electric ballast, wherein the lighting system comprises: a lamp housing with a front opening and a rear opening; a front lens closing the front opening; a discharge lamp put in the lamp housing, and a reflector put in the lamp housing to reflect light of the lamp toward the lens; wherein the electric ballast comprises: a ballast housing formed of conductive materials; a lamp socket put in the front of the ballast housing, said socket directly connecting with the lamp; a power converter put in the ballast housing, the output of said power converter being electrically connected with the socket; and an igniter put in the front of the ballast housing, said igniter being electrically connected between the power converter and the socket; wherein heat generating parts of the power converter are put in the rear of the ballast housing, the rear of said ballast housing functioning as a radiator, and wherein the electric ballast is attached to the outside of the lighting system so that the ballast housing closes the rear opening is electrically connected with frame ground via at least one of the lamp housing and the reflector.