An LED luminaire comprises a power switching driver, an electric current controller, LED array(s) powered by the electric current controller, and a detection and control circuit. The detection and control circuit comprises comparator(s), a voltage regulator circuit, and a pair of low-voltage input/output ports receiving an external voltage. The detection and control circuit is configured to extract a controllable feedback signal voltage from an output voltage coupled from the power switching driver, an output current driving the LED array(s), and the external voltage and to couple to the electric current controller to change the output current driving the LED array(s). The external voltage comprises a voltage sent from a wireless luminaire controller, which comprises a wireless module and a meter and control unit. The wireless luminaire controller is configured to receive commands from the wireless module, to control the LED luminaire, and to measure in response to the commands.