Wave a knife around in your kitchen with flickering lights. You'll see that the effect is not invisible, but an edge case. Just like with flickering LEDs on veh

Wave a knife around in your kitchen with flickering lights. You'll see that the effect is not invisible, but an edge case. Just like with flickering LEDs on vehicles, you can't tell right away exactly where the vehicle is. Just having a flickering light on the edge of your peripheral gives you the same alert feeling when an object is moving fast near you, such as a fly. Also, flickering room light probably interferes with rendering of moving objects on a computer / TV screen (though the effect would be subtle and the bugs in the computer would drown them out).