I saw these Himalayan Salt in spa and healthy store. I became curious so I do my research. Well what I read is fine with me the health benefits of it makes me think, it is worth a try. So I bought this one first because I went to buy another one but in a one huge salt which I also like. So this one is compose of many small salt rocks. This is the lamp I turn on at night and though it has light it doesn't affect your sleeping. I usually don't like lights when I am sleeping but not this one it helps you sleep. So I have two of this.