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?
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’."