Himalayan salt night lights carved into the shape of a cylinder. The tone of each stone ranges from very light pink to dark red, all having a gorgeous and pleasant glow in the dark. Himalayan Crystal Salt is the most beneficial, cleanest salt available on this planet. It was formed about 250 million years ago. A nightlight is a small light fixture placed for comfort or convenience in dark areas or areas that may become dark at certain times, such as at night or in an emergency.