Your body uses light to tell the time.
Light does more than help you see. It also tells your body what time it is. That signal shapes how you sleep, work and feel.
How it works
Special cells in your eye respond mainly to blue-rich light. They send a signal to the part of the brain that keeps your body clock.
Bright, cool light in the morning and at midday tells the clock that it is day. Warm, dim light in the evening allows your body to produce melatonin, the hormone that prepares you for sleep.
In 2017 Jeffrey Hall, Michael Rosbash and Michael Young received the Nobel Prize in Physiology or Medicine for their work on how this body clock works.
What inSona does across the day
07:00, dawn
Morning light tells your body that the day has started. inSona raises the light slowly from 2700 K to 3500 K, and brightness climbs to 60%.
12:00, midday
Bright, cooler light helps you stay alert. The room reaches 5400 K at full brightness.
18:00, nightfall
The light becomes warmer as the day ends. It falls to 3000 K at 80%.
21:00, night
Warm, low light supports melatonin and rest. The room falls to 2200 K at 10%.
Brightness and colour of light across one day
The height shows brightness. The colour shows the temperature of the light. Hours between the marked points are interpolated.
Show the values as a table
| Time | Stage | Colour | Brightness |
|---|---|---|---|
| 07:00 | Dawn | 3500 K | 60% |
| 12:00 | Midday | 5400 K | 100% |
| 18:00 | Nightfall | 3000 K | 80% |
| 21:00 | Night | 2200 K | 10% |
Source: inSona daily programme, insona.cc.
What light can and cannot do
Good light supports a healthy daily rhythm. It does not treat a medical condition. If you have a sleep disorder, please speak to your doctor.