Go 95% opacity in Bluelight Filter thanks to this addon. Try Night mode Shift.
Main app is required and can be downloaded for free at http://goo.gl/V2Asnc
Take care not to set the opacity too dark in order to operate properly your devices.
If you cannot operate your device anymore, please follow the following steps:
1. Turn off the screen.
2. Turn on the screen.
3. Wait for 10 seconds.
4. The filter opacity will be back at 80% if it was at more than 80%.
We shall not be responsible for any loss, damages and troubles.