Himalayan Salt Lamps emit energising negative ions, purifying the air, improving mood, and providing a natural-feeling light source. Negative ions help neutralise positive ions emitted from devices such as phones and computers. Water molecules attracted by the salt can carry positive ions. Salt crystals warmed by the bulb evaporate the water molecules, helping to neutralise the positive water molecules trapped in them. Illuminated salt crystals create a soothing, therapeutic glow.