Run the check
Start with the same subject, distance, and camera in the browser preview.
Add front-facing light and compare without changing applications.
Check any available exposure control and confirm its effect in a second app.
Read the result
A brighter scene that restores detail suggests insufficient light or automatic exposure behavior.
Limits and next step
Brightness alone does not reveal sensor sensitivity or the call app's processing.
Repeat the check after changing one setting or connection. Keep a record of what changed before deciding whether the device needs service.