There is also a new lighting system that has been implemented to allow you to read in darker environments without it hurting your eyes. (goodereader.com)
That's unfortunate, as the default setting is too bright for comfortable use in a dark environment. (digitaltrends.com)
It's especially convenient when you need a bright screen in sunny conditions or want to reduce battery life consumption in dark environments without having to manually adjust the setting. (techradar.com)