In my bedroom, the lights in the fan are still normal incandescent light bulbs, rather than florescent. This is because the lights in my room can dim, and most florescent bulbs can't dim. As you can see, the filament is visible. Power = I * delta V, and also = delta V^2/R. The power that is lost can be calculated, if you knew the resistance of the material of the filament. The change in voltage is the same as the voltage of the light bulb, or 40 watts. This loss of power as the current passes through the wire is the energy that becomes the light that we see. This is why a light bulb with a higher voltage, such as 60 watts, is brighter, since the voltage is higher and the power lost will also be higher.
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