Intensity, light level, light

EN: Intensity, light level, light

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The strength of the Incident Light independent of subject reflectivity, commonly measured in Foot Candles or Lux. High levels allow for increased Depth of Field (not always desirable) or faster shutter speeds (stills or high-speed filming). Optimum levels are what one strives for. Realistic levels are what one settles for.
Tiffan edu Glossary