I recently cam across a license plate frame that detects the flash from a traffic light or speed camera, it then triggers 2 xenon bulbs to flash at the just the right moment resulting in an overexposed image that can't be read and you get away ticketless. What a genius device, a perfect combination of electronic ingenuity and stickin it to the man. here's a link to their site http://www.nophoto.com/
Anyways, I would like to build my own which brings me to my question. What kind of light sensor could they be using? Some videos on their page show it detecting a camera flash in bright sun at over 100 feet. Im quite certain that a standard photoresistor is not that sensitive, They do show a photo of the sensor on their website but they dont give any technical details. Does anyone have a clue what it is or know another way to accomplish this?