Full-spectrum light

Full-spectrum light is light that covers the electromagnetic spectrum from infrared to near-ultraviolet, or all wavelengths that are useful to plant or animal life; in particular, sunlight is considered full spectrum, even though the solar spectral distribution reaching Earth changes with time of day, latitude, and atmospheric conditions.

Thermal sources such as incandescent bulbs produce electromagnetic radiation over a broad and continuous range of wavelengths, including infrared and ultraviolet.

As the temperature of a black body radiator increases, the shape of its spectral distribution changes with more energy emitted at shorter (bluer) wavelengths.

Some scientific instruments use discharge tubes to produce light that has only a few wavelengths in it, a so-called "line spectrum".

Since many artists' studios lack north-facing windows, full-spectrum lamps are sometimes used to approximate such light.

Full-spectrum fluorescent lamps are also used by color scientists, color matchers in paint stores and quilters and others working with fabrics or yarn when working under inadequate lighting conditions to assist in achieving the correct hues as they will later appear in daylight or under gallery lighting.

The use of full spectrum lighting assists aquarium plants to grow and aids in the health of the fish and the tank as a whole.

Grow lights are specifically intended to support plant growth, although with varying degrees of success and energy efficiency.

[5][6] A Cornell University study reached mixed conclusions on the use of full-spectrum lighting in restaurants to promote sales.