Patent ID: 7462994

Claim:
An LED illumination apparatus comprising: a radiative substrate; at least one LED provided on the radiative substrate; and a constant current circuit connected to said at least one LED, said constant current circuit including a transistor provided on one side edge of said radiative substrate, wherein said at least one LED is provided on another side of said radiative substrate separated from said transistor by a portion of said radiative substrate devoid of LED light sources and heat generating circuit components, wherein the constant current circuit further comprises: a Zener diode connected in a reverse direction with respect to a supply voltage; a transistor that controls a current flowing to the LED; a first resistor that controls an emitter current of the transistor; a second resistor that controls a current flowing to the Zener diode; and a diode connected in a forward direction to the supply voltage, wherein a collector of the transistor is connected to the LED, an emitter of the transistor is connected to the first resistor, a base of the transistor is connected to the Zener diode as well as the second resistor, the first resistor and the Zener diode are connected to each other and the second resistor is connected to the LED.