Feature


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Traditional electric lighting has typically allowed dimming but provided few, if any, other practicable options to adjust the light to suit the users’ needs. Now, with simple electronic or software control and the right combination of emitter types, an LED light engine can manage the spectral content with great precision to produce almost any colour or adjust “white” light throughout a range of correlated colour temperatures (CCT) expressing ambiences from warm, to cool, to daylight white. At any desired dimming ratio.


Arising from this new-found flexibility, concepts such as colour quality, mood lighting, and human-centric lighting have gained traction. Each offers an approach to creating a more comfortable, compelling environment.


Large lights from above that imitate a sunlit (blue) sky have the greatest biologically activating effect. Therefore, at the start of the day until lunch time and after the lunch break, bright, cold white light with a high blue component (such as 6500 Kelvin at an illuminance of 300 lux at the eye) should be used. Indirect light which includes both ceilings and walls is ideal for this. Towards the evening the lighting should be changed to


direct warm white light without blue components (such as 2700 to 3000 kelvin) to help our bodies relax and prepare for the night.


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