Nokia's Cyan update will let you further tweak brightness levels to your liking

[Windows Central]

Windows Phone 8.1 brought numerous new enhancements to the table, enabling consumers to take full advantage of Cortana (depending on region settings), a Notification Center and more, but there's more to come if you own a Lumia smartphone. Nokia will be rolling out a forthcoming firmware update, titled Lumia Cyan.
One of the improvements in Cyan, according to an image published over on Reddit, will be the addition of a brightness slider, perfect for those power users who require more settings to configure and reach a perfect Windows Phone experience.

Full story from the WPCentral blog...