No, salt lamps themselves do not erode, melt, or expire. They can last for years with proper care, which includes occasional cleaning. However, the bulbs inside salt lamps do have a limited lifespan.
Salt Lamp Lifespan and Maintenance
The salt crystal component of a salt lamp is remarkably durable. As stated by The Salt Lamp Shop, "salt lamps do not erode or melt or expire". They will continue functioning for an extended period provided they are cleaned regularly.
However, the internal light bulb has a finite lifespan. Multiple sources, including The Salt Lamp Shop and Himalayan Trading Co., indicate that salt lamp bulbs typically last around 1000 hours, or approximately 41-42 days of continuous use. Therefore, while the lamp itself is practically permanent, you will eventually need to replace the bulb.
Potential Issues: Corrosion and Sweating
While the salt lamp itself doesn't "go bad," it's important to note that some users have reported issues with corrosion. A Reddit post (https://www.reddit.com/r/mildlyinteresting/comments/146jzfg/my_pink_salt_candle_has_corroded_the_wall_around/) mentions a salt lamp causing corrosion on a nearby wall. This highlights the importance of proper placement and avoiding contact with surfaces that could be damaged by moisture. Additionally, salt lamps can "sweat" or weep in humid environments (https://saltworld.in/tips-and-tricks-to-maintain-himalayan-salt-lamps-and-stop-them-from-sweating/39). This is not a sign of the lamp failing, but rather a reaction to humidity.
Summary
Salt lamps themselves are very durable and don't have an expiration date. However, their light bulbs need replacing after approximately 1000 hours of use. Proper placement and care are crucial to prevent issues like corrosion and excessive moisture.
