Lightning-type spells were known for their speed. After reading the wind and frost spell, they had great pomp and grandeur. In the blink of an eye, lightning flashed and thunder rumbled. Streaks of pale blue lightning descended from the sky at a height similar to the descending wheel of flames, however, the speed at which they descended was on a completely different level. By the time he finished his sentence, lightning had already struck the ground.
In terms of sound effects, these two spells were also very different. Descending Wheel of flames let out a loud boom. In a single breath, the Lightning Array made a continuous sound like exploding beans. Clearly, it was not an attack that could be completed in a single round like descending wheel of flames.