An everbright lantern contains an Eberron dragonshard imbued with the effect of a continual flame spell. This bright light is mounted inside a normal bullseye lantern, allowing the light to be shuttered off. An everbright lantern casts bright light in a 60-foot cone and dim light for an additional 60 feet, just like a mundane bullseye lantern, but its flame never goes out.
Everbright Lantern
Wondrous Item