Patent ID: 11871489
Assignee: LUTRON TECHNOLOGY COMPANY LLC
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  F | IPC F  H

Claim 19:
20. The non-transitory, machine-readable, storage device of claim 19 wherein the instructions, when executed by the lighting device control circuit further cause the control circuit to, responsive to the determination that the lighting device should be placed in the INTERIM state:
increment a failure counter;
cause the drive circuit to provide an adjusted drive current to the at least one emitter using the data representative of the forward voltage across the photodetector;
calculate a second difference between the forward voltage across the at least one emitter at the adjusted drive current and the forward voltage across the photodetector; and
determine whether the second difference exceeds the defined threshold value; and
responsive to the determination that the second difference exceeds the defined threshold value:
increment the failure counter;
determine whether the failure counter exceeds a defined failure count threshold value; and
cause the lighting fixture to enter the INOPERATIVE state responsive to the determination that the failure counter exceeds the defined failure count threshold value.