John, this came up recently on Jason's(zarak)thread about his new TV. The facts appear to be that when the power goes off, both the TV bulb(if any)and the fan cooling it go off simultaneously. Since the bulb is off no additional heat is added and it doesn't get any hotter, it just takes longer to cool down than if the fan continued to run after a normal shut-off. No appreciable amount of extra wear-and-tear occurs. Restarting the bulb while still hot(e.g. if the power returned quickly)is said to be very harmful and most if not all display devices using bulbs are supposed to have temperature sensitive protective circuits to prevent this.
