2. Lighting

Lighting techniques designed to meet lighting needs are based on :

• photometry, whose values are :

  • luminous intensity (in candela - cd),

  • luminous flux (in lumen – lm),

  • illuminance (in lux – lx),

  • luminance (in candela per square metre – cd.m ^-2 );

• colorimetry, whose variables are color temperature (T _cp in Kelvin – K) and color rendering index (CRI or R _a on a scale from 0 to 100).

See