I was the first to reply to this thread... Post #2. Originally I said Light Flow... I take that back... it was good, but was not THE app I will now recommend.
1. Light Manager - it does a much better job with the notification LED. Much better than Light Flow, more options than Light Flow, plus no app in the notification tray.
2. Action Launcher - I have used Nova for a long time and still recommend it, but I changed to Action Launcher a few weeks ago. I really like their folders, plus ability to change a folder into a Cover... touching the Cover will launch the main app, but if you swipe up you open the folder... for example I grouped a few Auto related apps into a folder, then changed this folder into a Cover and if I touch the Cover it launches my main/first app, but if I swipe up it opens the folder so I can access all the apps. Other apps have a different action if I swipe up, like Gmail I can view a specific Gmail account inbox, which is nice since I have 3 Gmail accounts. These are just a couple things that make this launcher my current favorite.