Why does black form on the ceiling around my fluorescent bulb?

Question

It looks like its burnt, is it from radiation? I also notice it when I move my TV away from the wall, there will be black markings where the TV was.

Answer 1

I'm guessing that it's dirt that was carried thru the air by the currents caused by the heat of the light and the TV. Do you smoke?

Answer 2

I was going to say it must be mold due to the temperature of the light and the room tempearture, but now i am thinking maybe the type of paint you use to paint the room...