The setting is located under System Settings --> Display --> Notification light. You will find there the option to enable/disable the notification light for missed calls and voicemail, plus the ability to create/personalize new notification light alerts for your other apps.
XDA Developers was founded by developers, for developers. It is now a valuable resource for people who want to make the most of their mobile devices, from customizing the look and feel to adding new functionality. Are you a developer?