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Get the paid version of Lightflow. I've got it set so that my chargin light is a less harsh orange, more like a soft yellow, and the LED brightness set at 10%. You can still see that it's charging, but it doesn't light up the room like the standard one does. Same with the fully charged light, instead of it being bright and starting at 90% (Which is really stupid), I have it set again at 10% LED brightness and have set the charged threshold to 99%, so it only goes green when it hits.
Really cool app and definitely worth it for the Z2.