About 2,500 years ago, coloured lights were used therapeutically for various diseases including digestive problems, neurological conditions, anaemia, liver ailments, heart conditions and anxiety. The ancient Greeks and Egyptians used coloured minerals, stones, crystals, salves and dyes in every aspect of their daily life. Treatment sanctuaries were painted different colours to target healing specific organ systems. In the late 1800s, researchers found that people exposed to blue light experienced a lowering of their blood pressure, which increased when exposed to red light. In other tests involving hand-grip strength, a similar effect can be demonstrated.
Tension decreases with exposure to blue light and increases with red.
In the early 1930s, two psychologists in California established scientifically that blues can calm and relax while bright reds, oranges and yellows stimulate the nervous system in humans. The sun rises in the morning giving off a spectrum of light resulting in red, orange and yellow hues. This signals the start of a new day with new promises and endless possibilities. It's difficult not to feel energised by the sun and the promise of new beginnings. During the evening hours, the opposite is true.