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Per NoPhoto's FAQ's at http://www.nophoto.com/pages/education#section11
"I don't see the cameras near my location flashing during the day - will the noPhoto still work?"
The reason that you're not seeing the cameras flash is because they have installed a visible light filter over the flashbulbs. What this does is filter out light in the visible spectrum, only allowing infrared light to pass through and illuminate the plate. Since the noPhoto's sensor works with both infrared and visible light, the noPhoto will still fire and prevent the camera from obtaining an image.
"I don't see the cameras near my location flashing during the day - will the noPhoto still work?"
The reason that you're not seeing the cameras flash is because they have installed a visible light filter over the flashbulbs. What this does is filter out light in the visible spectrum, only allowing infrared light to pass through and illuminate the plate. Since the noPhoto's sensor works with both infrared and visible light, the noPhoto will still fire and prevent the camera from obtaining an image.