thanks for the follow up.

The InfraRed light source (and infrared light is also emitted at 
great heat - that's why a candle is working and a TV isn't) is 
*required*. The motion / accelleration sensors aren't used by Remote 
Buddy at this time and would probably also not be accurate enough to 
allow accurate mouse movements. For more background info on this, 
here's an interesting read:

http://www.wiili.org/index.php/Wiimote#IR_Sensor

I've implemented support for the IR sensor starting with a battery of 
candles on the desk in front of the screen and finally cutting down 
Remote Buddy's candle needs to one candle - which is a world premiere 
as far as I know ;-)

And, as said, the calibration has nothing to do with the intensity an 
IR light source has to have. It just allows you to define a different 
rectangle to be used for tracking. My advice: light a candle, place 
it in a safe place where it can't have any potential to burn down 
your place, then go into Preferences, activate mouse mode or 
calibration and have a look at the options for the connected Wiimote 
while pointing it to the candle. That's a good way to understand how 
the whole InfraRed sensor / mouse mode works.

Best regards, 
Felix