CGCookie - Unity: Fundamentals of Lighting

https://cgcookie.com/courses/fundamentals-of-lighting

This course is designed to teach you all about Unity's new Global Illumination system. Now that Unity 5 personal edition has everything "unlocked" you can create games that have amazing lighting and shadows applied, a feature once reserved for "pro" users. This will be a fairly short course that shows you the basics of lighting. Some lighting concepts we'll look at include: Light Probes for Sampling light, Directional Lights, Light Cookies, Static vs real time light maps, Spot Lights
Lighting plays an important part in how your game will looks, regardless of whether you're going for realism. Each light serves a specific purpose and you'll learn how to affect the mood of your game by using the lighting tools Unity has available.