Abstract: A mobile light tower (1) comprising a base unit (2) and at least one light (4a, 4b) connected to the base unit by an extendable mast (5), the base unit including a power source for powering the at least one light, the extendable mast (5) adapted to move between a retracted position and an extended position, wherein the mobile light tower includes a controller (6) and a wind speed sensor (7), the controller adapted to lower the extendable mast to an intermediate position, between the retracted position and extended position, when the wind speed sensor (7) determines that a predetermined wind speed is exceeded.