Incandescence is the emission of visible light from a hot object. When an object’s temperature rises, it emits radiation in the form of visible light. This phenomenon is called incandescence and is one of the most important principles in lighting technology. Incandescent lights produce their light through a process called thermal radiation, which occurs when heat energy from a filament wire is released as photons of light. This type of lighting is still widely used today, but has become increasingly less popular due to its low efficiency compared to other sources such as LEDs or fluorescent lamps.