The beneficial effects of salt lamps have been known for decades. Salt lamps emit negative ions, which work like natural ionizers keeping the air clean. Negative ions attach themselves to dust, pollen, mold, fungus and odors. This is very beneficial for promoting respiratory health. Salt lamps also minimize the effect of positive ions from EMF's and electronic devices, while the natural color of the lamp reinforces the rejuvenating and healing influence. For maximum benefits, leave your salt lamp on as much as possible. Salt is hygroscopic and will absorb moisture and liquid. The heat from the 15-watt bulb is warm enough to evaporate the moisture. This process is how the negative ions are released into the air.
In order to get the most benefits out of your salt lamp, it should be placed where you spend a lot of time, or perhaps near your electronic devices, and it should be left on as much as possible, but preferably at all times. If your lamp is not on, it is not acting as an air ionizer and giving off the negative ions. If you place your lamp in your bedroom and the light is distracting at night while sleeping, you may turn your light off before you go to bed, but be sure to turn it back on in the morning so it can work to clean the air and balance the ions all day long.