Heck, the entire parade actually has a backstory that very few visitors know about.
"The SpectroMen are keepers of light. They hold the parades magical light and transform it for you in the midst of the night. They come from a land called LightSpriation where everything is filled with rays of light and magical bursts of color. They were always afraid to come out of hiding and share their magical light, until one day, Mickey, the SpectroMen King, asked if they would join him in a nighttime festival of magic and light, and come and bring the magical light for everyone to see. Scared to confront people, they hesitated. After much consideration, the SpectroMen agreed. They brought along their magical SpectroBalls and Light-Trumpets to spread the joy of their magical light to everyone. Mickey controls the light they magically create and powers the parade through his Electro-ball, changing it from night to day, or crystal to multi-color."
This information was unearthed on April 2, 2008 from "The Site That Shall Not Be Named"