how to reduce backlight on iphone 2014 2015

Is the backlight of the iPhone is sometimes too bright, so the battery will drain faster. Therefore, set the
brightness slightly lower when you are in a dark environment. You can also make this do automatically. Another possibility is that you temporarily dims the backlight by putting your finger. Onto the light How it works? Read on!
To change the backlight, go to Settings> Brightness & Wallpaper. The slider allows you to change the
     brightness. With a switch, you configure the brightness to change automatically

Since iOS 7 has made ​​it even easier to quickly change. brightness screen Before you wipe the bottom of the 

screen upwards after which a separate panel is displayed, the Control Panel. Here you can find all kinds of useful features, including the screen brightness. Use the scroll bar below the five round buttons you can then
define their screen brightness.
Near the speakerphone to the iPhone is a sensor that when you switch the phone determines how strong the surrounding lighting. Are you in a dark environment, the backlight will be less bright. Are you in the sunlight, the backlight will be much brighter, so you can still read. Still display properly The sensor is active. When switching Do you want the screen seems a bit less bright, then you cover the sensor when you turn your
finger. The iPhone then thinks that it is dark and will make the backlight dims