Full-spectrum
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Full-spectrum light is light that covers the entire spectrum from low infrared to ultraviolet and above; in particular, sunlight is considered full spectrum, even though the solar spectral distribution reaching Earth varies with time of day, latitude, and atmospheric conditions.
"Full-spectrum" is not a technical term when applied to an electrical light bulb but rather a marketing term implying that the product emulates "natural" light. See http://www.lrc.rpi.edu/programs/NLPIP/lightingAnswers/fullSpectrum/lightSources.asp
Products marketed as "full-spectrum" may produce light throughout the entire spectrum, but actually do not produce an even spectral distribution, and may not even differ substantially from lights not marketed as "full-spectrum" See http://www.lrc.rpi.edu/programs/NLPIP/lightingAnswers/fullSpectrum/comparisons.asp
In recent years, full-spectrum lighting has been used in the treatment of Seasonal Affective Disorder (SAD) through the use of "light boxes" that mimic natural sunlight which may not be available in some areas during the winter months.
Lightbox Therapy, otherwise known as phototherapy, is a recognized modality for depression (such as SAD). Depending on the quality of the light, it is estimated that 10,000 LUX (candlepower) is needed for effective treatment. Not all light boxes are the same. It is recommended to seek treatment with natural light -- but be certain that the phosphorus used to mimic the natural light does not emit harmful ultraviolet radiation.
Before using phototherapy, seek the advice of a knowledgeable physician.
