CONTROLLING THE DRIVE SIGNAL IN A LIGHTING FIXTURE BASED ON AMBIENT TEMPERATURE

摘要

A lighting fixture includes a solid-state lighting source, such as an LED light source. A control module of the lighting fixture uses temperature sensing circuitry to determine a relative ambient temperature. When the ambient temperature is above a defined ambient temperature threshold, a drive signal is provided to the solid-state light source at a target drive level that corresponds to a normal light output level. When the ambient temperature is below the ambient temperature threshold, the drive signal is provided to the solid-state light source at a reduced drive level, which is lower than the target drive level.

主权项

1. A lighting fixture comprising:
a power supply; a solid state light source; temperature sensing circuitry; converter circuitry adapted to receive power from the power supply and provide a drive signal to the solid state light source; and a control module adapted to:
determine an ambient temperature based on information from the temperature sensing circuitry;when the ambient temperature is above an ambient temperature threshold, cause the converter circuitry to provide the drive signal at a target drive level; andwhen the ambient temperature is below the ambient temperature threshold, cause the converter circuitry to provide the drive signal at a reduced drive level that is lower than the target drive level, wherein providing the drive signal at the reduced drive level comprises ramping the drive signal up to the target drive level over a predefined period of time that is a function of the ambient temperature.