Tag nrho -spectrum lub teeb qhov chaw thiab xim pom. Full-spectrum light sources will probably provide excellent color rendering. Xim Rendering Performance index (CRI) values for full-spectrum lighting sources are typically greater than 90. Color is a human perception constructed from the combination of the spectral zog faib (SPD) of the light source, the spectral reflectance of the materials being illuminated, and the tri-chromatic nature of the human visual system. If there are gaps or large variations in the SPD of a light source, there is a potential for confusion between the apparent colors of objects. Since full-spectrum light sources usually provide radiant power throughout the visible spectrum, subtle differences in the spectral reflectance characteristics of different objects are discernable. So, when color identification is part of the visual task, such as for graphic arts, museums and color printing applications, full-spectrum light sources will ensure good color discrimination.
Tag nrho -spectrum lub teeb ci thiab kev ua haujlwm pom. Tag nrho - spectrum qhov chaw teeb pom kev zoo yuav tsis muab qhov pom kev zoo dua li lwm qhov chaw teeb pom kev zoo nyob rau ntau qhov xwm txheej. Kev pom kev ua tau zoo yog qhov ceev thiab qhov tseeb ntawm kev ua cov ntaub ntawv achromatic (xws li, luam tawm dub rau ntawm daim ntawv dawb) los ntawm tib neeg qhov muag pom. Nyob rau theem teeb pom kev zoo feem ntau pom muaj nyob hauv tsev kawm ntawv thiab chaw ua haujlwm, qhov pom kev ua tau zoo yog qhov tseem ceeb tsis cuam tshuam los ntawm kev faib hluav taws xob spectral ntawm lub teeb, yog li tag nrho - spectrum lub teeb ci yog, lumen rau lumen, tsis zoo dua li lwm lub teeb. qhov chaw.
Lighting produced by full-spectrum lamps may be, however, perceived as providing brighter architectural spaces than other lamps (Boyce, 2002; Berman, 1990). Three factors may contribute to this effect. First, full-spectrum light sources typically have a high Correlated xim kub (CCT) of 5000K - 7500K. Lamps with higher CCT values produce greater brightness perception than lamps with lower CCT of the same luminance. Second, most full-spectrum light sources have high color rendering properties, meaning that surface colors will appear more saturated. Greater saturation will also give the impression of greater brightness (Boyce, 1977). Third, the ultraviolet (UV) radiation produced by some full-spectrum fluorescent lamps has a fluorescing, brightening effect on textiles and paper that have been treated with whitening agents. These combined effects on brightness perception may indeed have positive impact on building occupants, but greater perceived brightness can also be a liability, depending upon the expectations of the space's occupants (Veitch and McColl, 2001).
Tag nrho -spectrum light sources thiab noj qab haus huv. Tag nrho - qhov chaw teeb pom kev zoo yuav tsis muab kev noj qab haus huv zoo dua li lwm qhov chaw hluav taws xob feem ntau. Kev tshawb fawb tsis ntev los no tau pom tias tib neeg kev ua ub no niaj hnub muaj kev cuam tshuam los ntawm lub hnub ci teeb / tsaus ntuj. Qhov tseem ceeb tshaj plaws ntawm cov niaj hnub no, los yog circadian, cycles yog pw tsaug zog / tsaug zog; tab sis lwm yam dej num suav nrog kev paub txog kev puas siab puas ntsws, kev xav, thiab tej zaum txawm tias qhov ua tau zoo ntawm kev tiv thaiv kab mob mus los ntawm cov qauv niaj hnub. Lub teeb yog qhov tseem ceeb tshaj plaws ib puag ncig stimulus rau kev tswj cov voj voog circadian thiab synchronizing lawv mus rau hnub ci. Luv wavelength (xiav) lub teeb yog tshwj xeeb tshaj yog zoo ntawm kev tswj lub circadian system; Qhov ntev wavelength (liab) lub teeb yog pom meej inconsequential rau lub circadian system. Yog li, txhawm rau ua kom muaj txiaj ntsig zoo tshaj plaws hauv kev cuam tshuam rau lub circadian system, lub teeb ci yuav tsum tsis txhob ua raws li tag nrho cov spectrum, tab sis tsuas yog yuav tsum ua kom lub zog luv luv xwb. Txawm hais tias tag nrho - spectrum lub teeb pom kev zoo suav nrog lub teeb lub teeb luv luv hauv nws cov spectrum, nws yuav tsis tas yuav ua kom muaj kev cai circadian zoo vim tias, ntxiv rau, qhov siv tau zoo, lub sijhawm, thiab lub sijhawm ntawm lub teeb raug yog txhua yam tseem ceeb rau txaus siab rau txoj cai circadian (Rea et. al, 2002).
Light therapy treatment of seasonal affective disorder (SAD) usually involves regulated exposure to a white light source, commonly 10,000 lux at the eye for 30 minutes per day (Partonen and Lönnqvist, 1998). Any white light source will be effective at these levels (Lam and Levitt, 1999), so full-spectrum light source is in no way special for treatment of SAD.
Full-spectrum light sources have no demonstrable benefit for dental health. These claims have no scientific merit (McColl and Veitch, 2001). The section, "Is ultraviolet radiation production important?" gives more detail.
