Colorful Light Effect in Photoshop

Last week I was waiting hours in airports, as usual, I was wandering and checking out banners and signs when I found a beautiful Sony ad of a cel phone called Xperia. The thing that really caught my attention was the wallpaper of the phone. It was a colorful light bean crossing the screen . I really like the effect and thought to myself, that is a good idea for a tutorial.

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