Run the check
Preview a stable scene under the current light and record when bands appear.
Try daylight or a different lamp without changing camera position.
If supported, compare available exposure or anti-flicker settings in camera software.
Read the result
Flicker only under one light source points to a light and exposure interaction.
Limits and next step
The browser does not expose the same camera controls on every device.
Repeat the check after changing one setting or connection. Keep a record of what changed before deciding whether the device needs service.