In case you haven't heard of the glance screen app, it allows you to See the time and other lock screen content when your phone is on standby. Choose the glance screen mode that suits you and enjoy the perfect balance of power consumption and visibility. Select night mode and your glance screen automatically dims during the set time range. Download glance screen and find it under Settings.
The latest update now allows you to set the lock screen photo as your glance screen background.
Lumia 930 doesn't support the glance screen feature because of the kind of screen/display it uses, so this is not a software issue but a hardware one, so don't try downloading it.