the present invention is based on a regulation circuit for making available a constant current supply on the basis of a transformer principle , in which there flows through the luminescent diodes a triangular a . c . current varying periodically around a d . c . current value . with this method it is afforded by means of a circuitry provision that both the charging and also the discharging current of an inductive reactance connected in series to the luminescent diodes , functioning as a storage choke for filtering of mains harmonics , flows as diode current through the luminescent diodes . the advantage of this method consists in a significant reduction of the overall power loss of the led illumination module . according to one exemplary embodiment of the invention the ceramic circuit board of the led illumination module in accordance with the invention has a direct mains current supply , which for protection from mechanical damage is accommodated in a transparent housing having a highly transparent polymer mass serving as optically active lens surface .