Patent ID: 8823270

Claim:
An interchangeable LED bulb having a standardized input impedance that is based upon an input current (I in ) and an input voltage (V in ) applied to said interchangeable LED bulb when said interchangeable LED bulb that is disposed in an LED light string without substantially affecting performance and luminosity of said light string comprising: an LED element having an operating voltage (V LED ) that is applied across said LED element and an operating current (I LED ) that flows through said LED element when said interchangeable LED bulb is placed in said LED light string; a first resistor that is connected in series said LED element having a resistive value that is approximately equal to (V in −V LED )/I LED a second resistor that is connected in parallel with said first resistor and said LED element having a resistive value that is approximately equal to (V in /(I in −I LED ) said first resistor and said second resistor being selected to have resistive values so that said LED element has a substantially predetermined luminosity and said interchangeable LED bulb has an input impedance that is substantially equal to said standardized input impedance so that said LED light string maintains a substantially uniform luminosity in said LED light string.