Light that motivates you to work, play and relax. It used to be that you had to buy different lights for different colour changes. We've solved that problem with colour temperature adjustability.
Think of the difference between fluorescent lighting and a camp fire. That's the difference between cool white light and warm white light. Colour temperature is measured in Kelvins; the higher the Kelvin, the cooler the light.
The culture we were raised in plays a key role in colour temperature preferences. Our own research has shown that people from the East often prefer a colder white light, while people from the West favour warmer tones.
Certain colour temperatures are more suitable for particular activities. A warm white light is preferable for socialising and relaxing, while a cooler white light helps people concentrate for work and studying.*
*'A comparison of traditional and high colour temperature lighting...' 2006: Berman, Newab, Martin and Sheedy.