Note- For this to work, you need either a dark room, or a piece of film over the webcam lens to filter out all light other than your lightsource

thats why I'm hesitant about this webcam stuff, it seems that to get something working you need to be in really specific conditions. Would it work better if you chose a color that is not seen much in the real world or in an office (magenta?) and use that as points?

You would have to go to a arts and craft store and buy those little sticky dots and slap them on your head. Then isolate that color in the bitmap. Might work better, and in any light.