Directed light question.

[Nevicar]

Hello again everyone!

I have another question about the game, but this time about the lights. Basically we have a large room, with a tunnel that goes up into a glass panel. I have tried and tried, through reading the wiki and trying videos, but I cannot seem to figure out how to have a beam shine down from there and be the only light in the room.

Here's a view of the map to help try and understand: http://i.imgur.com/psZDD.jpg

TL;DR:

I want to have a beam of light shining down a well from a window, which is a sizable distance. It will have a monster walk through it in a scripted event and cast a shadow.