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If I wanted to accurately reproduce the brightness of a real-world object in Cycles to see how Cycles rendered it, how would I convert the real-world units (like lux) into strength values?

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From the documentation: "Strength input: Strength of the emitted light. For point and area lamps, the unit is Watts. For materials, a value of 1.0 will ensure that the object in the image has the exact same color as the Color input, i.e. make it ‘shadeless’."

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    $\begingroup$ ...but I'd still like to know if there's a good way to measure this for materials. $\endgroup$ – Matt Aug 7 '15 at 22:44
  • $\begingroup$ Watts is a real world unit of measurement. Maybe you want something like a lux to watts conversion? $\endgroup$ – sambler Aug 8 '15 at 12:07
  • $\begingroup$ Yes, watt is a real-world unit, but this value for watts doesn't apply to materials, only to lamps. $\endgroup$ – Matt Aug 10 '15 at 14:59
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    $\begingroup$ Emission materials use watts per square meter. $\endgroup$ – user16342 Aug 11 '15 at 21:14
  • $\begingroup$ Cool! Do you have a source for that? $\endgroup$ – Matt Oct 2 '15 at 0:46

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