# Team:Cambridge/Tools/Lighting

(Difference between revisions)
 Revision as of 15:11, 26 October 2010 (view source)Willh (Talk | contribs)← Older edit Revision as of 15:28, 26 October 2010 (view source)Willh (Talk | contribs) Newer edit → Line 15: Line 15: =Modelling= =Modelling= + {{:Team:Cambridge/Templates/RightImage|image=Solar_Spectrum.png|caption=''Figure 1: The  solar radiation spectrum for direct light at both the top of the Earth's atmosphere and at sea level.''}} + {{:Team:Cambridge/Templates/RightImage|image=Fischerispectrum.jpg|caption=''Figure 2: The emission spectrum of V. Fischeri (shown in black)''}} + {{:Team:Cambridge/Templates/RightImage|image=photopicscotopic.png|caption=''Figure 3: Photopic (black) and scotopic (green) luminosity functions.''}} + + + :$F=683.002\ \mathrm{lm/W}\cdot \int^\infin_0 \overline{y}(\lambda) J(\lambda) d\lambda$ + + where + :$F\,$ is the luminous flux in [[lumen (unit)|lumen]]s, + :$J(\lambda)\,$ is the [[spectral power distribution]] of the radiation (power per unit wavelength), in watts per metre. + :$\overline{y}(\lambda)$ (also known as $V(\lambda)\,$) is the standard luminosity function (which is dimensionless). + :$\lambda\,$ is wavelength in metres. + + + American Society for Testing and Materials (ASTM) Terrestrial Reference Spectra, a common standard used in photovoltaics + + + 1,413 – 1,321W/m2 + "Chapter 8 – Measurement of sunshine duration" (PDF). CIMO Guide. World Meteorological Organization. http://www.wmo.int/pages/prog/www/IMOP/publications/CIMO-Guide/CIMO%20Guide%207th%20Edition,%202008/Part%20I/Chapter%208.pdf. Retrieved 2008-12-01. {{:Team:Cambridge/Templates/footer}} {{:Team:Cambridge/Templates/footer}}