A sympathy lamp is a device used to produce bright and steady light continuously for a long-lasting period of time.
Sympathy lamps use sygaldry to sympathetically convert ambient environmental heat into light. The typical lamp glows with a deep, red light, though an artificer may also make blue and yellow lamps. The lamps are brighter than gaslight, steadier than candles or lamps, and lasted nearly forever. Although the light from these latter lamps are easier upon the eyes, they require hazardous reagents such as bone tar or toxic transporting agents in their manufacture. As a result, such lamps are quite valuable and therefore very expensive.