The guys at Kelby Training offer a FREE iPad/iPhone app that teaches a lot about lighting.
Scott Kelby browses through his portfolio as he discusses and demonstrates the lighting setups used. It is complete with lighting diagrams, gear guides and commentaries.
• Over 20 different shots covered across 13 lessons
• Approximate Runtime: 45 mins
• Gear Guides
• Lighting diagrams
See more and get the app at iTunes.
Check this and many more apps from Kelby Training on their website