Because the light goes into the remote and the remote picks up the signal and sends it to the tv.
Like when you take a flash light and make shadow puppets with your hands. If no light then no puppets. The shadows don't need a data cable. It is the same with the wii.
And what kinda light did you use? Standard yellow light or blue led new flash light?
Then what is the sensor bar for?
This is also why the pointer disappears from the screen if you put your hand in front of the remote - you are blocking the remote's ability to see the sensor bar.
So the flashlight basically then is doing the same thing essentially replacing the need for a sensor bar right?
But a candle is not infared?