A combination of a wireless endoscopic video camera unit and an endoscopic portable light source unit, said wireless endoscopic video camera unit comprising: an image sensor for sensing images of a surgical site and including an electronic image shutter; a light detector for sensing the presence of light at a surgical site and providing a light presence signal; a camera controller for receiving the sensed images from the image sensor and providing a video output to a video transmitter, said camera controller receiving the light presence signal for measuring an actual light source phase and an actual light source ON time, wherein said camera controller determines a light source target time value and a light source target ON time from the actual light source phase and the actual light source ON time and information from the sensed images; by using a closed loop feedback system provided by the light detector; and a camera non-video RF transmitter for receiving the light source target time value and the light source target ON time from the camera controller and for outputting a wireless RF signal that includes the light source target time value and the light source target ON time, and, said portable endoscopic light source unit comprising: a light source non-video receiver for receiving the wireless RF signal from the camera non-video RF transmitter; a light source for outputting light to a surgical site; a light source battery for supplying power to energize the light source; and a light source controller for controlling operation of the light source in response to the light source target time value and the light source target ON time, wherein the wireless RF signal from the video camera unit that is provided to the light source unit synchronizes the light output from the light source with the electronic image shutter of the image sensor so that light output does not occur when the electronic image shutter is closed. an image sensor for sensing images of a surgical site and including an electronic image shutter; a light detector for sensing the presence of light at a surgical site and providing a light presence signal; a camera controller for receiving the sensed images from the image sensor and providing a video output to a video transmitter, said camera controller receiving the light presence signal for measuring an actual light source phase and an actual light source ON time, wherein said camera controller determines a light source target time value and a light source target ON time from the actual light source phase and the actual light source ON time and information from the sensed images; by using a closed loop feedback system provided by the light detector; and a camera non-video RF transmitter for receiving the light source target time value and the light source target ON time from the camera controller and for outputting a wireless RF signal that includes the light source target time value and the light source target ON time, and, a light source non-video receiver for receiving the wireless RF signal from the camera non-video RF transmitter; a light source for outputting light to a surgical site; a light source battery for supplying power to energize the light source; and a light source controller for controlling operation of the light source in response to the light source target time value and the light source target ON time, wherein the wireless RF signal from the video camera unit that is provided to the light source unit synchronizes the light output from the light source with the electronic image shutter of the image sensor so that light output does not occur when the electronic image shutter is closed.