Full light spectrum refers to a light that covers the electromagnetic spectrum from infrared through near-ultraviolet or all wavelengths. Despite the variations in spectral distributions of sunrays reaching various parts of the Earth, sunlight is considered full spectrum. Lighting products sold as “full spectrum” may emit light during the entire spectrum, but in reality do not produce an even spectral distribution and do not differ significantly from the products marketed as “full spectrum.”

Color Rendering Index, (CRI) and Color Temperature are the standards for measuring light. And any light is called full spectrum when they meet the measurement of 90 or higher on a Color Rendering Index, (CRI), or 5000 K on Kelvin Color Temperature ratings. Full spectrum lights are usually used by artists working in studios or in places where there is lack of sufficient north sunlight. Full spectrum light enables the artist to make better use of colors. With full spectrum light the artist can ensure that the colors are visible as they will when the works are exhibited in the home or an art gallery. Scientist also use full spectrum light bulb to match colors in paint stores where north sunlight is unavailable.

Gardening work carried out under lights help plants to bloom all round the year. In the recent past they have also been used to cure seasonal affective disorder (SAD) through the use of light boxes that mimic natural sunlight. On the basis of quality of light, it is estimated that 10,000 lux is required for effective treatment. However the research conducted by various governmental agencies along with the experts reveals that full spectrum lighting does not hold any advantages over other lighting systems.