Lamps are structures exclusive to the Hamlet DLC. They can be found in many rooms within a Mant Hill. They provide light in otherwise dark rooms of the Mant Hill. Each Lamp provides a bit less light than that given off by a Miner Hat. Lamps can be mined for Honey, though they are not renewable.
During the Aporkalypse, Lamps will not give off any light but are still able to be mined. They will give off light again once the Aporkalypse has ended.