HUDWAY Cast is equipped with its own ambient light sensor. However, you can adjust the projection brightness manually, if you feel like.
For that, please do the following:
1. Connect HUDWAY Cast to your smartphone (Learn how to do it)
3. Tap to increase or decrease brightness to the needed level:
Please note that in order to manually adjust the brightness through the app on Nexus & Pixel phones, you may need to establish a wired connection between the phone and the device.