Gem of Brightness
Wondrous item, uncommon · 2014 rules, SRD 5.1
50 charges. Bright light 30 ft (no charge); beam 60 ft: 1 charge, DC 15 Con or blinded 1 minute; cone 30 ft: 5 charges, same save. Becomes nonmagical at 0.
Also in the 2024 rules (SRD 5.2).