[Radiance-general] Illuminance Values in Ecotect/Radiance

[Christopher Rush]

May seem silly, but a 10x difference seems like the difference between lux and footcandles. Maybe your site measurements are in fc, or maybe you are multiplying your Radiance results to convert to lux when they were already in lux?

If you know your illuminance and lux measurement for one point, and can estimate the surface reflectance, you can check the formula L = E * R / Pi to see if it all makes sense. If L is in cd/m2 then E must be in lux for that formula.

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