Unique large salt lamp is made from salt crystals gathered at the foothills of the Himalayas; thus ensuring their deep and mineral rich scarlet glow. Heating the salt with the included bulb releases negative ions into the air, creating an effect similar to an ionizer. The outside surface of the lamp stays cool to the touch, as the heat of the light is dissipated within the salt. Due to the natural variation in rock salt, weight, size, color and shape may vary. Shape of stone may vary slightly. Includes one 15 watt bulb but can accommodate up to a 40 watt bulb-perfect for massage therapists who wish to heat the salt balls. Salt Crystal is a Natural Air Purifier. The Himalayan Natural Crystal Salt Lamp also works as an air purifier. When lit, the lamp emits negative ions that fight against positively charged particles that cause you to feel stuffy and sluggish. The lit salt crystal clears the air naturally of allergens like smoke, pet dander, pollens, and other air pollutants. It dilutes odors so that you can breathe easier. People with asthma often find it helpful in reducing their symptoms. You can keep the lamp lit for as long as you like to maintain this purifying effect. Heat from the bulb (in our salt lamps) or flame (in our candle holders) causes the salt to emit negative ions. These negative ions bond with the pollutants in the air (positive ions) and neutralize them. Works as an air purifier by emitting negative ions into the air and supplying light therapy to reduce stress and increase energy. Each lamp is individually handcrafted and unique. Sits on a beautiful Onyx base. Comes with 15-watt bulb, on/off switch and 6-feet electric cord (complete lamp).