a light bulb generates visible light when it is turned on
halogen_lightbulb is not incandescent_bulb. car_light_bulb is light_bulb. incandescent_bulb is not light_bulb. light_bulb is lamp. if_bulb is broken_does_not_make_light. incandescent_bulb is light_bulb. halogen_lightbulb is incandescent_bulb. light_bulb is light_source. if_bulb is not broken_does_not_make_light.