It usually appears as a mysterious glowing sphere which drifts through the air. It can also appear to bounce along the ground. Light balls are described as glowing balls of plasma. The phenomena usually lasts for only 5 seconds, but sometimes remains longer. Some of the balls are blindingly bright, others have almost no illumination and appeared grayish.
Light balls can vary in size and shape - the norm being the size of an orange or grapefruit.
The diameter of the balls range from a few centimeters to a few meters, with the average around 20 cm. They are sometimes oval, cylindrical, flame, pear, ring, or blob shaped. Cylindrical forms can sometimes be flattened, bent, or twisted into a variety forms. Sometimes they have halos, sparks, or radial streamers around them. Some appear to be fibrous.