Patent ID: 7671541

Claim:
A light-emitting, diode lamp, the diode lamp for replacing a filament lamp, the diode lame comprising: a light-emitting diode; a load resistor, the load resistor being in series with the light-emitting diode for forming a two-component, first current path; a current-limiting diode; and a low resistance resistor, the low resistance resistor being in series with the current-limiting diode for forming a two component, second current path, a potential difference being applicable across the first and second current paths for driving current through said paths, enabling light emission from the light-emitting diode, and simulating a relatively low resistance through the diode lamp; and wherein the diode lamp is usable in combination with resistance detection means for detecting resistance through the diode lamp, the resistance detection means providing a lamp replacement signal when detecting a relatively high resistance through the diode lamp.