Drita: Dallime mes rishikimesh

Burime të ndryshme përkufizojnë dritën e dukshme si e ngushtë nga 420 në 680<ref>{{cite book|last=Laufer|first=Gabriel|title=Introduction to Optics and Lasers in Engineering|url=http://books.google.com/books?id=4MxLPYMS5TUC&pg=PA11|accessdate=20 October 2013|date=13 July 1996|publisher=Cambridge University Press|isbn=978-0-521-45233-5|page=11}}</ref><ref name="Bradt2004">{{cite book|last=Bradt|first=Hale|title=Astronomy Methods: A Physical Approach to Astronomical Observations|url=http://books.google.com/books?id=hp7vyaGvhLMC&pg=PA26|accessdate=20 October 2013|year=2004|publisher=Cambridge University Press|isbn=978-0-521-53551-9|page=26}}</ref> dhe gjerësi 380 në 800&nbsp;nm.<ref name="OhannesianStreeter2001">{{cite book|last1=Ohannesian|first1=Lena|last2=Streeter|first2=Anthony|title=Handbook of Pharmaceutical Analysis|url=http://books.google.com/books?id=DwPb4wgqseYC&pg=PA187|accessdate=20 October 2013|date=9 November 2001|publisher=CRC Press|isbn=978-0-8247-4194-5|page=187}}</ref><ref name="AhluwaliaGoyal2000">{{cite book|last1=Ahluwalia|first1=V. K.|last2=Goyal|first2=Madhuri|title=A Textbook of Organic Chemistry|url=http://books.google.com/books?id=tJNJnn0M75MC&pg=PA110|accessdate=20 October 2013|date=1 January 2000|publisher=Narosa|isbn=978-81-7319-159-6|page=110}}</ref> Nën kushte ideale laboratorike, njerëzit mund t’i shohin rrezet infra të kuqe deri në 1050&nbsp;nm<ref name="Sliney1976">{{cite journal| last1=Sliney | first1=David H. | last2=Wangemann | first2=Robert T. | last3=Franks | first3=James K. | last4 =Wolbarsht | first4=Myron L. | year=1976 | title=Visual sensitivity of the eye to infrared laser radiation | journal=[[Journal of the Optical Society of America]] | volume=66 | issue=4 | pages=339–341 | doi=10.1364/JOSA.66.000339 | url =http://www.opticsinfobase.org/josa/abstract.cfm?uri=josa-66-4-339 | quote=The foveal sensitivity to several near-infrared laser wavelengths was measured. It was found that the eye could respond to radiation at wavelengths at least as far as 1064 nm. A continuous 1064 nm laser source appeared red, but a 1060 nm pulsed laser source appeared green, which suggests the presence of second harmonic generation in the retina. |subscription=yes}}</ref>, fëmijët dhe të rinjtë mund t’i perceptojnë gjatësitë valore ultravioletë rreth 310 në 313&nbsp;nm.<ref name="LynchLivingston2001">{{cite book|last1=Lynch|first1=David K.|last2=Livingston|first2=William Charles|title=Color and Light in Nature|url=http://books.google.com/books?id=4Abp5FdhskAC&pg=PA231|accessdate=12 October 2013|edition=2nd|year=2001|publisher=Cambridge University Press|location=Cambridge, UK|isbn=978-0-521-77504-5|page=231|quote=Limits of the eye's overall range of sensitivity extends from about 310 to 1050 nanometers}}</ref><ref name="Dash2009">{{cite book|last1=Dash|first1=Madhab Chandra|last2=Dash|first2=Satya Prakash|title=Fundamentals Of Ecology 3E|url=http://books.google.com/books?id=7mW4-us4Yg8C&pg=PA213|accessdate=18 October 2013|year=2009|publisher=Tata McGraw-Hill Education|isbn=978-1-259-08109-5|page=213|quote=Normally the human eye responds to light rays from 390 to 760 nm. This can be extended to a range of 310 to 1,050 nm under artificial conditions.}}</ref><ref name="Saidman1933">{{cite journal| last1=Saidman | first1=Jean | date=15 May 1933 | title=Sur la visibilité de l'ultraviolet jusqu'à la longueur d'onde 3130 | trans-title=The visibility of the ultraviolet to the wave length of 3130 | journal=[[Comptes rendus de l'Académie des sciences]] | volume=196 | pages=1537–9 | language=Fr | url =http://visualiseur.bnf.fr/ark:/12148/bpt6k3148d}}</ref>