Lighting is definitely weird.
Long lights act as spotlights, they project a cone of light and have no diffuse, so they illuminate what's in front of them but anything else stays dark (if you place them on a roof the roof itself remains dark, walls as well).
Vertical light on the other hand project a spherical light, which is handy, but it goes through anything so you'll end up with light going everywhere (different floors, out of the base, etc).