Hi everyone, pretty basic question
i’m trying to fake a church window rendering (with the colored light) similar to:
The best way i’m seeing how to do this is create a bp with a light changing color gradually. In real life it doesn’t change color but hopefully if the transition is smooth enough it could look ok. I tried with a light function but it doesn’t affect the color of the light, only intensity 
However I can’t find for the life of me a tutorial on how to do this, only neon like change.
This is what I have and it doesn’t work:
If anybody has any idea for my original problem i’m a taker aswell ( i thought about decals ? )
thanks !