If you want one lens of the Duo seires camera to be as bright as the other all the time, you can do that in seconds. Here's how to sync them on Reolink App.
Applies to: Reolink Duo, Duo 4G, Duo WiFi, and Duo PoE.
Step 1. Launch Reolink App. Tap the Device Settings gear icon.
Step 2. Go to Display > Advanced.
Step 3. Enable Sync Brightness. Please note that each time you toggle this switch, the camera will reboot automatically.
Step 4. Done! You've synchronized the brightness for the two lenses of the camera successfully.