This salt lamp is perfect for your medium to large bedroom. It is our best seller. Many of our customers choose this 9-11 lb. salt lamp, as it is in the middle of our size range. It is reasonably priced and emits a good amount of ions. This lamp is rated for a medium to large bedroom. It is always better to go a little bigger when you are unsure of room size, as you can never over-ionize, but you can under-ionize. Also, multiple lamps in one room is also a good idea, as the cumulative total of salt in the room dictates the protection coverage. In fact, an additional lamp in a room serves another source of ionization which spreads the ions more evenly throughout the air.