Abstract: For a decorative string or Christmas tree light assembly, a lamp holder comprising a major lamp base supported on an auxiliary lamp base to holder a lamp socket, the major lamp base having a switch at a bottom thereof, the switch having two opposite ends respectively connected to the electric circuit of a decorative string or Christmas tree light assembly, and wherein disconnecting the lamp socket from the major lamp base causes a conductive spring in the auxiliary lamp base to connect the switch permitting the electric circuit of such decorative string or Christmas tree light assembly to be constantly electrically connected.