I don’t know of any game engines where they attribute real-world units to lighting and material values, since those kinds of things tend to be driven more by the appearance than the physical correctness. The relative intensities of, say, a candle and a 100W light bulb are probably more important than the absolute values.Lighting: The Rendering Equation
- What units should I use for lighting in a 3D rendering engine?
- Moving Frostbite to Physically Based Rendering 2.0
- Physical Units for Lights
- Physical Lighting Units
- Filament lighting/units
- Understand physical light units
- Lighting: The Rendering Equation
- Using Physically Correct Brightness in Cycles, emission