be deemed as limiting the present invention any combination of circuits where the resistors the transistors and the led lights are assembled and the control chip 610 can be used to send a signal to turn the transistors on and thereby the led light on shall fall into the scope of the present invention thus the variable resistors 623 629 633 639 643 and 649 can be replaced by fixed resistors and the number of the red blue and green led lights 627 637 and 647 and the elements corresponding to each led light can be set or modified according to the requirements of the user fig6 is a schematic view of the assembled serial light emitting string light of the present invention the assembled serial light emitting string light are serially connected using wires 5 connected to the led lights 7 so that each light can be connected in serial as a long string which can be used for christmas decorations by creating a cheerful atmosphere with varied luminance of the lights furthermore each light can be put up onto the tree by hanging the clip hooks 4 on the peripheral of the outer sleeve 2 onto small braches which makes decorating much easier meanwhile with the engaging mechanism of the present invention the lights can be prevented from undesired detaching and are easy to assembly and disassembly the attached drawings are for reference only and by no.