Dream Lamps are found naturally within Vethea on structures, which usually are made up of Dark Everstone. They can be mined by hand.
Besides being used for decoration, Dream Lamps also emit light. However, they need to be powered by Acid to emit light. Dream Lamps have a simple yet unique GUI for inserting Acid. Once the Acid is inserted, the Dream Lamps will turn green and give off light.
The length of time the Acid lasts for is unknown. It appears to last for quite a long time (if not indefinitely).