Patent ID: 7675241

Claim:
A lighting apparatus formed by a plurality of serially-driven lighting units, comprising: a lighting module, comprising: at least two lighting units, and at least three transformers, wherein a first end of a first port of one transformer of said at least three transformers is connected to a first end of one lighting unit of said at least two lighting units, a first end of a first port of another transformer of said at least three transformers is connected to a second end of said one lighting unit of said at least two lighting units, a second end of the first port of said another transformer of said at least three transformers is connected to a first end of another lighting unit of said at least two lighting units, and a first end of a first port of a terminal transformer of said at least three transformers is connected to a second end of said another lighting unit of said at least two lighting units; and a feedback control circuit connected to a second end of the first port of said terminal transformer of said at least three transformers that is connected to a terminal lighting unit of said at least two lighting units, so as to output a control signal according to the current flowing through said terminal lighting unit of said at least two lighting units.