I actually tried that for a contract project about 10 years ago. It didn&#x27;t work. If you blink slower than 20 times per second it&#x27;s really annoying to the user. And if you blink faster than 10 times per second it&#x27;s pretty easy to take a picture with a long exposure and get the whole image. So there is no blink speed that offers even marginal protection without making the image useless.