I've nearly been blinded by my iPhone's light of 1000 suns several times.. at night, trying to read an article or checking a text message in a dark movie theater. Even on the dimmest setting, my phone is still too bright... which is why this my favorite iPhone trick to date (via cultofmac)
Here’s how to do it:
1 – Go to Settings >> General >> Accessibility >> Zoom >> Enable Zoom
2 – Tap your screen three times with three fingers to pull up menu
3 – Tap Choose Filter then select Low Light
4 – Go to Settings >> General >> Accessibility >> Accessibility Shortcut >> Set to “Zoom”
5 – Press home button three times to toggle brightness.
If you get lost just follow the GIF walkthrough below: