Light Flow Legacy: LED Control is an Android app developed by Reactle that caters to users who do not wish to have a persistent notification icon. It is a free app available in the Utilities & Tools category. This version of Light Flow is designed for Android 6.0 users and provides the same features as the standard version of Light Flow, except for Android 6.0 Run-time permissions, camera flash control, and alarm-only mode notification.

If you have the full version installed, this app will give you the features of the full version. If you do not have the full version, it will give you the features of the lite version. However, if you still have a persistent notification after disabling the full version, you can try going into your phone settings, apps, select "Light Flow" (i.e., not Light Flow Legacy), and press "force stop."

Overall, Light Flow Legacy: LED Control is an excellent choice for Android 6.0 users who want to control their LED notifications without a persistent notification icon.