You can notice a single frame of light at faster than 200FPS, but it's a lot harder to notice a frame of darkness at 100FPS. That has more to do with signal res

You can notice a single frame of light at faster than 200FPS, but it's a lot harder to notice a frame of darkness at 100FPS. That has more to do with signal response and nerves taking longer to drop down after a lot of stimulus than vice-versa. Appearance of fluidity has to do with a succession of similar frames, not the interjection of a vastly dissimilar one.