I have Moto G on Lollipop, and I mistakenly set the brightness bar to zero. Now, the screen is completely darkened and I'm not able to see anything.
How to set back the brightness to usable mode without hitting factory reset?
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Using ADB Tool, you can adjust the device brightness, by following command
adb shell settings put system screen_brightness 200
In order to get more info about what ADB is and other details refer the adb tag-wiki.
To Run below command, you need following:
Try to increase brightness in the same dark condition. Lock the phone using power button. Swipe up. Swipe down twice. Then try to move your finger left to right on the top 30% of your screen. Eventually you will be able to get your screen back. Do it patiently. It works. And be careful till this bug is fixed.