A counterweight or sandbags can be used to help secure your light stand and prevent it from falling over. If you are using a vertical light stand, you will want to sandbag the legs of the light stand to help stabilize it. If you are using a light stand with a boom arm, you will want to add a counterweight to the end of the boom opposite of your light—a sandbag can be used, but a backpack or other piece of gear can be used in a pinch.