@Chai,
WRONG!! Unless you have a Time Machine and went back to the late 1800's, we no longer use vaccumes inside our incandescent light bulbs, but rather a mixture of inert gasses, each to do a particular task like extending the life cycle of the bulb, and also increasing the amount of light produced from the tungsten filament, and also stopping the various elements from evaporating, which was also helped by the fact that just by having the various gasses in there, and NOT having a vaccum, there was a much more natural atmospheric pressure within the bulb, which was much closer to the very atmosphere we all love and enjoy on a day to day basis!
