I wonder how well these work compared to the real thing? A 150W light bulb shining through holes in a rotating piece of wood produce beams flashing over the eyes. This exact method to produce the effect is difficult (impossible?) to replicate with a PC monitor (unless you're a hacker in a movie).

Of course the effect might still work; but while I'm curious about it, I'm not in the mood to try this now. So judging/dismissing these implementations now would be unfair.