Indusclassic LG-08 Rectangular Himalayan Crystal Rock Salt Lamp Ionizer Air Purifier Ions effective area 60 - 65 Square Feet ( Estimated ) Unique salt lamp is made from Natural Himalayan salt crystals hand mined in the Himalayan Mountains Works as an air purifier by emitting negative ions in the air and light therapy to reduce stress and increase ener Heating the salt with bulb releases negative ions into the air, creating an effect similar to an ionizer, purifying the surrounding air Each Natural Salt Lamp comes with 15-watt bulb and 5-feet electric cord