Kindle Reading Customization and Enhanced Typesetting
For the Fire TV, ongoing for those wanting to reduce the brightness of the home menu screen, can try setting the Allow Video Autoplay "OFF" in the Setting's Preferences (see posted pictures), :
Fire 7 Kids Edition Tablet: How to Adjust Brightness (Increase/Decrease) - YouTube
Eversolo Screen and Knob Brightness Adjustment and Screensaver Settings Tutorial
Paperwhite Signature Edition - adjust brightness? | Kindle Forum
Amazon Fire HD 10 review: cutting the wrong corners proves a costly mistake | Amazon | The Guardian
Kindle Fire first impressions | Ars Technica
Amazon Kindle Fire HDX 7 - Learn & customize the home screen - AT&T
SOLVED: The picture is very dark. - Amazon Fire HD 10 - iFixit
Fire Light (Kindle Tablet Edition):Amazon.co.uk:Appstore for Android
Using Quick Settings on Your Fire Tablet - dummies