Hey!
thank you so much for reacting to my questions so quickly. This really helped me a lot and gave me the answers I was looking for and also propelled my further search into the right direction. In the studio scene I had a lot of objects that had emissive light, and I wanted to change them all at the same time together with my rectangular lights.
So I was able to make this blueprint that makes sure that all lights turn red when you press ‘R’, green when you press ‘G’, blue when you press ‘B’ and white when you press ‘W’. It also starts playing footage on the screens when you press ‘P’.
Thanks again for reacting to my questions!