There is quite a bit of controversy regarding box turtles and lighting. Some experts say that box turtles do not require full spectrum lighting, but it is good for their psychological welfare. Other experts say that full spectrum lighting is necessary to prevent calcium deficiency. Suffice it to say, full spectrum lighting certainly does no harm, and may do a world of good, so it is recommended for use with box turtles. Full spectrum lighting refers to a special type of fluorescent bulb manufactured for use with reptiles. Full spectrum lights simulate the wavelengths of natural sunlight. Irradiation by certain wavelengths of light is thought to provide reptiles with vitamin D3, which is necessary for the absorption of dietary calcium. Without full spectrum lighting, many reptiles suffer from a calcium deficiency known as metabolic bone disease, often termed "soft shell disease" when seen in turtles.