Load control device for a light-emitting diode light source having different operating modes

A lighting control method, comprising:

• receiving, by lighting control circuitry, an input that includes data representative of a target intensity of an operatively coupled lighting load;
• determining, by the lighting control circuitry, whether the received target intensity is greater than a defined threshold intensity value;
• and
• causing, by the lighting control circuitry responsive to the determination that the received target intensity is greater than the defined threshold intensity value, operatively coupled load regulation circuitry to operate in a first operating mode in which the duty cycle of the load regulation circuitry is held constant and target current is varied to achieve a defined load current that corresponds to the received target intensity;
• and
• causing, by the lighting control circuitry responsive to the determination that the target intensity is not greater than the defined threshold intensity value, the load regulation circuitry to operate in a second operating mode in which the target current is held constant and a duty cycle of inverter circuitry included in the load regulation circuitry is varied to achieve the load current that corresponds to the target intensity.

A non-transitory, machine-readable, storage device that includes instructions that, when executed by lighting control circuitry operatively coupled to load regulation circuitry, cause the lighting control circuitry to:

• receive an input that includes data representative of a target intensity of an operatively coupled lighting load;
• determine whether the received target intensity is greater than a defined threshold intensity value that corresponds to a minimum load current of an operatively coupled lighting load;
• and
• cause the load regulation circuitry to operate in a first operating mode in which the duty cycle of the load regulation circuitry is held constant and target current is varied to achieve a defined load current that corresponds to the received target intensity responsive to the determination by the lighting control circuitry that the received target intensity is greater than the defined threshold intensity value;
• and
• cause the load regulation circuitry to operate in a second operating mode in which the target current is held constant and a duty cycle of inverter circuitry included in the load regulation circuitry is varied to achieve the load current that corresponds to the target intensity responsive to the determination that the target intensity is not greater than the defined threshold intensity value.