The LED isn't too bright either so it certainly should not be a distraction when charging in dim lighting conditions on the desktop or night stand. (neowin.net)
Upgraded camera functionality - You can take better pictures under dim lighting conditions. (dealspwn.com)
There are two types, rods and cones, and it has generally been assumed that rods are responsible for seeing in dim light conditions, whereas cones allow vision in bright light. (sciencedaily.com)