There are so many benefits to Himalayan Salt Lamps.
The heat generated by the lamp causes the salt to release negative ions into the air, which can help purify the air, improve respiratory health, and promote relaxation.
They help with symptoms of allergens, pollutents, asthma, stress, poor sleep. The negative ions from the lamp reduces the effects of electrical appliances in your space. 
If you suffer from Seasonal Affective Disorder, you will really benefit from having a Himalayan salt lamp in your environment. The soothing amber glow and negative ions will lift your mood, thus alleviating negative feelings. 
The lamps are also highly recommended for anyone suffering anxiety or depression.
Please note the lamps vary from the photo and weigh between 1.5-2kg each. Because they are carved from salt no two lamps are the same and will vary in colour and shape.