Method and system for controlling lighting

A method of controlling lighting in an illuminated common space, comprising:

• automatically changing at least one of color rendering index (CRI) and color temperature (CCT) to separately change lighting quality in one or more spaced apart zones of the common space while maintaining a substantially constant illumination level throughout the common space, the change in the lighting quality being carried out by independently controlling light sources that separately light the zones and wherein the change in lighting quality is made in response to sensing a change in the occupancy level or activity in one or more of the zones.

A method for controlling lighting, comprising:

• (a) sensing an occupancy level within a space illuminated by a light source that emits light having a first color rendering index (CRI) and a first illumination level at a first electrical power level, the light source comprising a plurality of light emitting diodes;
• and
• (b) in response to the sensed occupancy level, adjusting the light emitting diodes of the light source so that the light source emits light having the first illumination level and a second CRI that is less than the first CRI, the light source when emitting light having the second CRI operating at a second electrical power level that is lower than the first electrical power level.