When the voltage is high, 100v, how does the filament appear?

when voltage is high say 100V than the light will be a lot dimmer than design because the light is usually designed to be operated at 240V. If the supply voltage to the bulb is 100V, the filament dissipates 34.7W power and thus the temperature of the filament will be less and hence the bulb does not produce so much light.