Medium Salt Lamp Crystal Height 8 - 10 Inches Crystal Width 6 - 8 Inches Crystal Weight 9 - 11 Lbs Protection Area 12x12 Sq.ft Includes wooden base, cord, and bulb 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.