Incandescent Light Source

In this sense the light is emitted through something else.

Incandescent light source.

Incandescent lamps are often considered the least energy efficient type of electric lighting commonly found in residential buildings. The fluorescent light spectrum is called an emission spectrum because the source of the light is the output of electrified gas. Halogen lights produce a more constant light output over time without much dimming. The most obvious example is an incandescent light bulb because of its name electricity flows through a thin wire filament causing it to heat up and glow.

If that were done in the open air in the presence of oxygen the metal filament would burn up before it got that hot. Halogen incandescent lamps will use less power to produce the same amount of light compared to a non halogen incandescent light. Other examples off the top of my head. In the case of an incandescent light spectrum the source of the light is the energy itself.

White hot iron in a forge red lava flowing down a volcano and the red burners on an electric stove are all examples of incandescence. Luminous efficacy of a light source is the ratio of the visible light to the total power input to the source such as a lamp. Incandescent light is emitted from a heated object. An incandescent light bulb or light source is any device that uses electricity to heat a filament or wire until it is hot enough to glow white.

To emit white light an object must be heated to at least 1 341 f 727 c. They are made in an extremely wide range of sizes wattages and voltages.