Computer software like Flash or video editing software has background effects available to add to the video. The basic lightning flash effect is available in the program or available for download, depending on the specific software used for the effect. This effect adds a streak of lightning that the editor of the video places in the appropriate location for the video. The editor can then add a crash of thunder for sound effects that follows about one or two seconds after the lightning effect.
Background lightning is seen in movies during a storm. Rather than an actual streak of lightning, the background lightning effect shows a flash of light from a window, door or other location without the actual lightning. This creates a storm feel as a background effect rather than a primary effect.
Animated videos often use lightning effects to either show a background scene like a storm or use the effect to show rivalries or similar feelings among characters in the show. The common lightning effect in animation videos is the clash of lightning between rival characters or competitors. This effect has the lightning flash from the two characters' eyes and then meet in the middle to crash and break apart.
The lightning ball effect is used in movies that have a fantasy or science fiction feel. This effect takes a basic lightning strike and places it in a circle to create a ball. There are downloads available for this effect. Downloading the effect and then adding it to the video can create the feel of a powerful character in the video or add a fantasy feel to the video.