Set a login screen different from the current wallpaper

I've set up my wallpapers to rotate every 30 minutes. When I lock my screen I do not want the current wallpaper to be shown as background but a specific login screen picture. I put that picture under ~/Library/Caches/Desktop Pictures/{UUID} and it does work after I restart the computer but when I lock it when I take a break it always takes the current wallpaper as login screen background.

Is there any possibility to change this behaviour?