Nostopburn
Nostopburn is a second level evocation with an instant casting time, a range of touch, a material requirement of five milligrams of ruby dust, and an indefinite duration.
This spell creates a single candle power flame that produces no heat, nor does it consume oxygen. The flame will rest about an inch above whatever object upon which it is cast, and will last until dispelled.
The oldest known use of nostopburn is as a navigational aid for ships. A single candle does not sound very bright, but at night, the light is visible for thirty miles. The most common use of the spell today is as a nightlight.
The most extended continuous use of nostopburn is by the Fire Department of Livermore, California. In 2015 a party was held celebrating its one-millionth hour. Daily visitors stop by to see the flame that has been alight since 1901. If you would like to see the glow without traveling, the Fire Department maintains a webcam on their website.