Hello Elonmir!
The lighting effects triggered by in-game events are nothing to be concerned about. Razer even has an Overwatch-licensed version of the BlackWidow keyboard (not sure if that’s the one you’re using).
The one thing to be aware of, we’ve seen some cases where the Razer apps aren’t working as intended, and causing Overwatch to go to a black screen then crash when you try and run it. If you run into any such issues when using the Razer apps, please try uninstalling them to address that.
Best of luck in your adventures 