-lights that change colour through the day to adjust to our bodies circadian rhythm-‘According to a basic physics definition, this light has a high color temperature, while evening light has a far lower color temperature. Lighting that offers the ability to adjust color temperature could benefit human health, mood, and productivity’

-brake lights that can communicate with the brakes of the car following too closely;

-controlling the spectral composition of grow lamps to improve the out-of-season production of fruits and vegetables.
(Via Treehugger.)