| Word | Description |
| Kelvin (K) | A measurement for the characteristics of visible light in determining color temperature, often used for categorizing CCT |
| Ketones | A waste product made by the body when it is using fat as an energy source. |
| Ketosis | Ketosis is a process in which your body converts fats into energy. During the conversion, ketones are produced as a by-product. Ketones can give your breath a sweet, fruity smell that may be mistaken for alcohol. Because long periods of ketosis can be dangerous to your kidneys and liver, ketogenic (low-carb) diets are never recommended by health professionals for more than short-term use, typically no longer than 14 days. |
| Kilowatt-hour (KWH) | Used on utility bills to define a unit of energy usage, e.g. a 100 way light bulb (0.1 KW) used for 10 hours (0.1KW X 10H) consumes 1 kilowatt hour of energy during that time. |
