Lighting is an essential part of modern life. It not only helps us see in the dark, but is also used to enhance the aesthetic appeal of a room. However, did you know that light can also be used to improve our moods, boost productivity and even treat certain medical conditions? Light therapy, also known as phototherapy, is a fast-growing field in medicine. It uses lights of various colors, strengths and wavelengths to directly treat physical and psychological disorders. Light therapy can be used to help treat depression, seasonal affective disorder (SAD), insomnia and general stress. It also provides relief from jet lag, improves sleep and helps with pain management. Most light therapy devices use blue or more often white light. Exposure to these types of light can affect the concentration of neurotransmitters in the brain, such as serotonin—a hormone responsible for regulating mood. They can also help reset the body's internal biological clock, also known as the circadian rhythm. When it comes to home lighting, it is important to bear in mind that different lights can promote different moods. For example, cool blue light can stimulate the brain, making people alert and aware, whereas warm yellow light has a calming and relaxing effect. The use of lighting in our everyday lives therefore has the potential to improve our overall wellbeing, which is why it should be given special attention. Whether it is light therapy, the choice of lights for a room or the intensity, color and direction of a light source, there is much to consider when it comes to lighting in order to improve our quality of life and overall health.