The bulb will heat the salt and the surface will become very warm. Cord includes a twisting dimmer knob that functions as a brightness control and on/off switch. When turned on, this lamp will create a relaxing orange glow. Great for use in bedrooms, on office desks or cubicles, living rooms, restaurants & hotels and therapeutic & meditative rooms.

https://www.amazon.com/Mineralamp-NSL-101-Salt-Medium-Orange/dp/B01I567G84