In the second shot, the stripes of light are coming from the top.
When I first started this map I knew nothing, not even that light had properties that could be manipulated (falloff, angle, etc) so I thought of this little gimmick to kinda get light the way I wanted it.
In shot two, you see a little bit of a white light texture in at the top, it's illusionary. Behind it is a shaft with a bright light at the end. This allows you to focus bright light into any shape you want, in this case, a rectangle. By moving the light closer or father away you can change the sharpness of the projected light.
It's a cool effect. You can have very controlled bright light in otherwise dark areas. The contrast becomes even cooler when enemies move between the shafts of styled light.
Now that I know how to change light parameters It's not my go-to way of lighting, however, I still use it for it unique effect in certain areas.
Here are some very early shots, the top right was the first use of the shaft light method.
http://www.killpixel.com/kpcn/KPCN_old.jpg