A lighting system provides for independent control of both the brightness of an LED light fixture and the perceived color of the light emitted by the LED light fixture. The LED light fixture has two LED light sources, a control circuit alternately pulses the two LED light sources and changes relative duty cycles of the light sources to alter a perceived color output of the lighting fixture, in response to a change in a control signal from a controller. Duty cycles of the light sources are a function of the control signal and vary inversely. The LED light fixture also receives a control signal for controlling a current level provided to the LED light sources to independently control the brightness of the lighting system.