A method and apparatus for adjusting the drive signal of an LED luminaire is provided and includes an LED light source assembly, an ambient sensor circuit, a comparator circuit, and a driver circuit. The ambient sensor circuit provides an ambient signal to the LED light source assembly, which is a function of the ambient (such as temperature, humidity or air visibility) proximate to the LED light source assembly. The comparator circuit provides a bidirectional ambient adjustment signal to the driver circuit, which is a function of the ambient signal and a reference signal. And the driver circuit provides an adjustable drive signal to the LED light source assembly, which is a function of the bidirectional ambient adjustment signal.