lamp units u 200 are parallel connected to extension cords the power source ends whereof are parallel connected with the ac to dc output ends constituted by the power source side control device cd 101 transformer device tr 101 output side control device cd 102 and rectifier device br 100 in addition the random power generator device rps 100 and the random power generator device controller rpc 100 are also installed on extension cords while output ends of the random power generator device controllers rpc 10 of same polarities are parallel connected across extension cords said environment light and darkness detector device s 100 of said lamp driving circuit of power source and charge discharge device in parallel connection can be optionally installed as needed to control the power source side control device cd 101 or to control the output side control device cd 102 of the transformer device tr 101 or to control central control unit ccu 100 which controls the power source side control device cd 101 or the output side control device cd 102 or said environment light and darkness detector device s 100 can be optionally selected not to be installed each component of said lamp driving circuit of power source and charge discharge device in parallel connection as described above can be independently installed or integrally combined by relevant components said lamp driving circuit of.