A light-emitting adder allowing to obtain a high brightness, integrated, substantially coherent light beam illuminating a target area either evenly or with increased brightness in the center of the illuminated spot, comprises a plurality of light sources located in a same plane and beam-shaping means provided with beam-transporting means in order to form the resultant beam. The position detector detects the position of the recordingreproducing head. In one embodiment of the invention, additional header information may be inserted into a MACSec packet before transmitting the MACSec packet to a non-MACSec-enabled node.