In one embodiment the invention provides a device for modulating light. The excitation source is comprised of a heating element coupled with an alternating current generator. The outer contours of said individual plates are adapted to the reactor in such a manner that in case of a plurality of loading elements being arranged side by side a parquet-like closed surface is formable when said filling tubes extend through filling openings into said tubes of the reactor. The second circuitry is configured to receive and process the pseudorandom sequences during blockage conditions. The third portion extends between the first portion and the second portion.