You can change when to flash and which apps will flash the LED when there are new notifications.
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Go to Settings, and then tap
Sound & notification.
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Under
Notification, tap
Flash notifications.
Choose whether to always flash the LED or flash it only when the screen is off.
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Tap
App light notifications.
Choose which app notifications you want the LED to flash for.
Tip: In other apps, check their settings to find out if they have an option for flashing the LED.