Not to be confused with Concentrating Solar Thermal Power (CSP), Concentrating Photovoltaics (CPV) systems use mirrors or lenses to focus the sun's light onto a small area of photovoltaic material. By focusing the sun's light (usually by several hundred times, but potentially by up to 1000 times) in order to reduce the amount of expensive semiconductor material that is needed to produce a usable quantity of energy, and so reduce the overall costs of the system.