There's so much misinfo spreading about this, and while I don't blame you for buying it, I do blame you for spreading it. "It sounds legit" is not how you should decide to trust what you read. Many people think the earth is flat because the conspiracy theories sound legit to them.
DeepSeek probably did lie about a lot of things, but their results are not disputed. R1 is competitive with leading models, it's smaller, and it's cheaper. The good results are definitely not from "sheer chip volume and energy used", and American AI companies could have saved a lot of money if they had used those same techniques.
This doesn't account for blinking.
If your friend blinks, they won't see the light, and thus would be unable to verify whether the method works or not.
But how does he know when to open his eyes? He can't keep them open forever. Say you flash the light once, and that's his signal to keep his eyes open. Okay, but how long do you wait before starting the experiment? If you do it immediately, he may not have enough time to react. If you wait too long, his eyes will dry out and he'll blink.
This is just not going to work. There are too many dependent variables.