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Central to the Lighthouse technology are the Base Stations, small rectangular objects placed in the room. They serve as reference points for any positionally tracked devices such as the HMDs and controllers. Base Stations perform this function by flooding the room with a non-visible light, the receptors on the tracked devices would intercept the light and figure out where they are in relation to the Base Stations. Multiple Base Stations (2 for SteamVR) allow the tracked devices to figure out where they are in the 3D space.
Each Base Station contains numerous LEDS and 2 laser emitters that spin rapidly. 60 times per second, the LEDs would flash and 1 of the 2 spinning lasers would sweep a beam across the room. The receptors, HMDs and controllers, are covered with photosensors that recognizes the flashes of light and laser beams. When it detects a flash of light, the receptor starts to count til one of its photosensors are hit by the laser beam. Lighthouse calculates ''When'' the photosensor is hit and ''Where'' that photosensor is located to find the exact position of the receptor in relation to the Base Station. When there are 2 Base Stations, the position and the orientation of the receptors in the 3D space of the room is established.
==Non-VR Applications of Lighthouse==
