USB Heart Salt Lamp, by using a Himalayan Salt Lamp you replace the negatively charged ions in the air which help us to avoid the alleged physical and mental harm that the ‘electric smog’ creates. Each USB Salt Lam. Rather than sell them by size we sell them by approximate weight. Items are marked with sizes to give a rough idea of size only, each lamp is completely unique. Please note: Due to the hygroscopic properties of salt Himalayan salt lamps and candle holders absorb moisture from the air. If your lamp is 'sweating' or leaking water this is generally due to being switched off for extended periods, especially in humid conditions. To remedy, leave in strong sunlight for 4 to 5 hours and brush off any excess crystals. Or wipe gently with a dry cloth. If you don't use the Himalayan salt lamp for long periods of time (eg when on holidays), disconnect the cable and remove it from the lamp. In humid conditions, we recommend placing your lamp onto a small tray or dish in case they may pool water.