How to mkae lighting that fades to darkness in both directions of the y axis

So, i havent really messed around with lighting tools before. Whats going on is, my player is in a tube, one that is going up and down in the y direction (picture being really deep inside a Super Mario pipe). I want the light to be bright where the player is located, but i want everything to fade to darkness if he looks up or down. how would one go about this? Would i change the settings in the lighting window, the camera properties, or both?