Tim Clodfelter: The Brown Mountain lights dance in the night sky, shimmering and mysterious … at least that's what I've heard. The lights - seen in the night sky over Brown Mountain - have been reported as far back as the 18th century. The lights will be the focus of the Brown Mountain Lights Heritage Festival this weekend.On a recent trip to the Brown Mountain area, I didn't see any lights.Sorry.But I did meet several people who said that they have seen the lights.David Mull, a scruffy, enthusiastic man in his mid-50s, has been fascinated with the mysteries of Brown Mountain since he was a child. In the early '60s, a folk song called "(Legend of the) Brown Mountain Light," performed by Tommy Faile, led to a boom in interest in the lights.Mull was about 8 at the time. As the song grew in popularity, roadside lookout points - previously used for gazing at the scenery - became hot spots for gawkers hoping for a glimpse of the lights. One hotel owner charged people 50 cents a car to park in his lot. Mull's dad balked at the exorbitant charge, so they found another place to park. Mull has made himself an expert on the lights. He has produced two documentary videos, The Brown Mountain Lights and The Mysterious Lights of Brown Mountain, and touched on the subject in several other documentaries.Mull said he saw the lights when he was a child and has seen them many times since. But sightings are still a rarity, even for him.Mull said that it's hard to say what he does for a living. Mostly, he said, he sells videotapes of his documentaries, raises and sells carnivorous plants, and does odd jobs. He devotes much of his plentiful energy to the Brown Mountain lights and other local lore.Mull offered to act as a tour guide. He met us in the parking lot of a Kmart in Morganton and led us to several of the best places to see the lights.