3-4 kg will be enough for 10-12m2 rooms. The greater the weight of the Salt Lamp, the more its effect increases. It will be more beneficial to buy a lamp larger than the square meter of your room. TUZSHOP Salt lamps are made by hand hammering from rock salt extracted from 150 meters underground from Çankırı Salt Cave, without damaging its naturalness. SHIPPING IS AVAILABLE FROM ÇANKIRI. Comes with cable and bulb attached.