- Full-spectrum light
Full-spectrum light is light that covers the
electromagnetic spectrumfrom infraredthrough near- ultraviolet, or all wavelengths that are useful to plant or animal life; in particular, sunlightis 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 bulbbut rather a marketing term implying that the product emulates natural light.Cite news
volume = 7
issue = 5
title = Full-spectrum Light Sources
work = Lighting Answers
accessdate = 2007-11-01
date = September
url = http://www.lrc.rpi.edu/programs/NLPIP/lightingAnswers/fullSpectrum/abstract.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". [Cite web
last = Galidakis
first = I.N.
title = The Double Amici Prism Hand-Held Spectroscope
accessdate = 2007-11-01
url = http://ioannis.virtualcomposer2000.com/spectroscope/amici.html#fullspectrum]
Color temperatureand Color Rendering Index(CRI) are the standards for measuring light. In general, Kelvintemperature ratings of 5000 K or higher and CRI of 90 or higher denote a truer, full-spectrum light.
A cube of
carbonwill radiate light of varying spectral power distribution(SPD) as it is heated. At 0 K, it is pure black, while at about 5,000 K to 5,500 K, it appears similar to noon daylight.
Use in art and in color matching
fluorescent lampsare used in the art studio by artists who paint pictures on canvas when they paint at nightor inside (ideally, during the day the art studio should have north sunlight, but many artists don't have access to north sunlight so they use full-spectrum lamps instead) in order to make sure that the colors they are using appear in their natural hueas they will appear when the painting is displayed in a homeor in an art gallery.
Full-spectrum lamps are also used by color scientists or color matchers in
paintstores to match colors at night or inside when they don't have access to north sunlight.
Use in gardening
Gardening under lights keeps plants blooming almost year-round, for a wintertime harvest.Some plants grow better when given more of a certain color light, due to the mechanism of
Use in seasonal affective disorder
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. Light is an environmental stimulus for regulating circadian cycles.
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 luxis needed for effective treatment. Not all light boxes are the same. It is possible the phosphors used to mimic the natural light emit harmful ultraviolet radiation.Dubious|date=March 2008
The non-profit [http://www.lrc.rpi.edu/ Lighting Research Center] , a group of utility companies, experts and government agencies, established the [http://www.lrc.rpi.edu/programs/nlpip/ National Lighting Product Information Program] (NLPIP) to provide objective information about the effectiveness of different lighting systems. According to the NLPIP, full-spectrum light does not provide any improved benefits over similar light systems. [ [http://www.apollolight.com/new_content/light_therapy/full_spectrum_controversy.html The Full-Spectrum Controversy] - Apollo Light] [ [http://www.lrc.rpi.edu/programs/nlpip/lightingAnswers/fullSpectrum/abstract.asp Full-Spectrum Light Sources] - Light Research Center] [ [http://www.sylvania.com/content/display.scfx?id=003680192 Sylvania's Statement on FS Lighting with US Gov links] Sylvania PDF]
A Cornell study casts doubt on the use of full-spectrum lighting in restaurants to promote sales. [Cite news
title = Cornell study finds full-spectrum lighting has no effect on restaurant sales
work = Cornell Chronicle
accessdate = 2007-11-01
date = 2007-09-14
url = http://www.news.cornell.edu/stories/Sept07/restaurants.lights.RN.html]
* Cite journal
last = Gifford
first = Robert
title = Scientific Evidence for Claims about Full-Spectrum Lamps: Past and Future
url = http://irc.nrc-cnrc.gc.ca/pubs/fulltext/ir659/gifford.pdf [http://web.uvic.ca/psyc/gifford/]
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