Infrared radiation is a type of electromagnetic radiation that is invisible to the human eye, but can be felt as heat. It is emitted by all objects that are above absolute zero, including light bulbs. The amount of infrared radiation emitted by a light bulb depends on its temperature. The higher the temperature of the light bulb, the more infrared radiation it will emit.

Light bulbs also emit visible light and ultraviolet radiation. The visible light is what allows us to see the light bulb, while the ultraviolet radiation can be harmful to our skin and eyes. However, the amount of ultraviolet radiation emitted by a light bulb is much less than the amount of visible light and infrared radiation.