They hurt. The candles send out infrared lights just like the sensor bar, so that's what confuses the Wii. In the same way, they can be a replacement for the sensor bar if it gets lost or damaged. Multiple infrared things confuse the crap out of the Wii. The sensor bar only sends out infrared beams, once it triangulates the Wiimote location, the Wiimote Bluetooth sends it back to the Wii, showing the position on the screen. So check which things around your Wii send out the beams.