Everbright Lantern
Wondrous Item, common
This bullseye lantern contains an Eberron dragonshard that sheds light comparable to that produced by a continual flame spell. An everbright lantern sheds light in a 120-foot cone; the closest 60 feet is bright light, and the farthest 60 feet is dim light.
Source: Eberron: Rising from the Last War p. 277, Wayfinder’s Guide to Eberron p. 115