Colour temperatures and intensities of common real-world light sources, plus exposure values for different lighting situations.
Physical Light Units (Unity HDRP) ↗
More indoor levels (Archtoolbox) ↗
Credit: Unity Technologies. Content and "Lighting & Exposure Cheat Sheet" image © Unity Technologies, from the Unity HDRP documentation; summarised here as a workflow reference. All rights belong to Unity. Unity is a trademark of Unity Technologies.
Light values based on real-world measurements, like the numbers on bulb packaging or a photographic light meter. For lights to behave correctly, keep scene scale at 1 unit = 1 metre.
Units
cdCandelaLuminous intensityThe SI base unit. A common wax candle ≈ 1 cd.
lmLumenLuminous fluxTotal visible light emitted in all directions. Scene brightness stays the same when the source gets bigger, but its highlights get dimmer.
1 cd × 1 sr = 1 lm
lxLuxIlluminanceLight arriving on a surface: lumens per square metre.
1 lm ÷ 1 m² = 1 lx
ntNitsLuminanceSurface brightness of the source. A bigger source adds more total light, while highlight intensity stays the same.
1 cd ÷ 1 m² = 1 nit
EVExposure valueCamera exposureAny shutter speed + f-number pair giving the same exposure shares one EV. EV100 = EV at ISO 100.
Light intensities