Bio-energetic crystal salt was created over millions of years ago, when the ocean waters dried up in various parts of the world. The crystal is hand excavated into various sizes and drilled inside to accommodate a light source. When lit by a small, energy efficient light bulb of 15 watts or less, crystal salt emits an electrical charge, enriching our environment with health promoting negative ions. Negative ions help purify the air of allergens, dust, smoke, bacteria and more. These natural qualities make them an excellent beautiful light source, natural air purifier and can help people with various health conditions including asthma, allergies and other respiratory ailments. They can be used in every room, safely and should be left on as much as possible.