LED-lit ceilings can mimic the changing hues of natural light Researchers are looking at how dialing up and down the brightness, color and richness of household lighting can help regulate our circadian rhythms. They are the mental and behavioral changes that occur in response to light cues over each 24-hour period. In the living room: Where people gather to watch TV or play games, a whiter light is best. Turning off electronic devices and switching to a softer, warmer color of yellow or orange two hours before bed will help the body get ready for sleep. The kitchen: The quality of light for cooking is a major consideration. Lights with high-color rendering help colors pop and bring out details of meat, vegetables and other ingredients. It helps the food look good. Bathroom: Rich color rendering with over 90 CRI is desirable for applying makeup or shaving. We need more light to see as we age, so a dimmable light allows people to adjust the lighting. Adult bedrooms: Dimmable lights with a warmer glow are ideal to minimize the disruption of melatonin, the hormone that makes us sleepy. It is produced when the lighting dims. Hallways: Ultralow and warm lighting helps people navigate halls and stairs without affecting their night vision.