UNREAL UE4.2 - How to focus lights only on specific actors and ignore everything else?

Hi, I want to create lights for every character, these lights wont affect anything, only each specific character BP components i want to iluminate with them, meaning if this light is red, character A Will be affected receiving a red light, but carácter B, C D E and any other object arround Will be ignored by the light and shadows.

How can i focus lights and shadows on specific characters or actors and ignore everything else?

Please help with BP images if needed, Thanks