A lamp, comprising a base of the lamp configured with a wireless transmission component. The stator has a stator yoke, a plurality of stator magnetic poles projecting from the yoke, and excitation and output windings applied to the stator magnetic poles. Scattered radiation originating from the normal and oblique illumination beams may be distinguished by employing radiation at two different wavelengths, by intentionally introducing an offset between the spots illuminated by the two beams or by switching the normal and oblique illumination beams on and off alternately. The initializing unit initializes the paper information stored in the paper information storing unit during a certain period. The non-elastic wall is turned back on three sides and sewn to a second elastic wall opposite the first to form a bag-shaped structure with an opening for flexible laminae of a cradle frame.