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Ambient light is the surrounding environmental light that is everywhere – equally intense and with no directionality. Even though the light is equally intense, the brightness can vary greatly. “Lux” is the amount of visible light illuminating a point on a surface. Typical Lux values are given in Table 1. An ambient light sensor must be sensitive over the same range of intensities. In fact, the ambient light sensor is asked to operate beyond these extremes, especially on the dimmer side. It is not unusual that a sensor be placed inside a device where it only receives a fraction of the ambient light.
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