Light timing matters, but a phone or watch cannot see every photon that reached your eyes.
The light exposure result uses the inputs below.
What does morning light exposure mean?
The result turns several inputs into one clear view.
What goes into the calculation?
- Timestamped supported light or daylight observations
- Morning, daytime, and evening timing windows
- Estimated circadian phase, bedtime, wake time, and adaptation state
The app uses supported data and reads it in context.
What happens when data is missing?
No reading is better than a made-up reading.
What can this calculation not tell you?
The app can show a pattern, but it cannot prove a cause.
Your next step for light exposure
Compare like days before you judge the trend.
Related calculations
See light exposure in your own data
Body Insights shows the inputs and the change behind the result, so you can choose your next step.
See my light exposure