Our 15 watt globes are designed to fit within the small holes of Himalayan Salt Lamps and Selenite Lamps. Because of their small size and the wattage of these globes they are fairly fragile and should be handled with care . To extend the life of your globe please ensure they are screwed firmly into the light fitting and do not move the lamp while it is on. Salt lamps are designed to stay on 24/7 and turning them on and off can blow the globes. Small and large power surges will also shorten the globes life. When fitting a new globe into your lamp, do not touch the glass with your fingers (use a tissue) the oil from your skin can cause 'hot spots' on the globe and cause it to blow. With proper care, these globes can last for months.