Unreal Tutorial - Types of Light

The light types Tutorial is located here: https://docs.unrealengine.com/latest/INT/Engine/Rendering/LightingAndShadows/LightTypes/index.html

UE 4 has four different light types:
Directional lights - used for primarily outdoor lighting or infinite distance light casts.
Point lights - are a light bulb like light. They emit light in all directions from a single point.
Spot lights - These emit light from a point, but are focused into a cone.
Sky lights - Will capture the background of the scene and apply it as lighting to the level's meshes.

All of these lights can be set to Static, Stationary or Movable, except for the Sky light.