luminous exitance


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Related to luminous exitance: Luminous emittance

luminous exitance

n
(Units) the ability of a surface to emit light expressed as the luminous flux per unit area at a specified point on the surface. Symbol: Mv
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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At each time step, the daylighting module calculated the luminous exitance of the shaded and non-shaded window areas depending on the position of the shading device(s).
where, [M.sub.i] was the final luminous exitance of a Lambertian surface 'i' [lm/[m.sup.2] (lm/[ft.sup.2])], [M.sub.oi] was the initial luminous exitance of surface 'i' [lm/[m.sup.2] (lm/[ft.sup.2])], [[rho].sub.i] was the diffuse light reflectance of surface 'i', [M.sub.j] represented the final exitance of all other surfaces in the room [lm/[m.sup.2] (lm/[ft.sup.2])] and [F.sub.ij] was the form factor between surface 'i' and all other enclosing surfaces in the room.
where, [E.sub.p] was the total horizontal illuminance at point 'p' [lx (fc)], [C.sub.pj] is the configuration factor from point 'p' to a surface room 'j', [M.sub.j] is the luminous exitance of surface 'j' after infinite inter-reflections [lm/[m.sup.2](lm/[ft.sup.2])], [C.sub.pls] is the configuration factor from a point to the light shelf and [M.sub.ls] is the light flux transmitted through the shelf per unit area [lm/[m.sup.2] (lm/[ft.sup.2])].