Abstract: A lamp for a light string has a socket, multiple electric cords, an insulating partition, a leaf spring and a bulb assembly. The electric cords are mounted in the socket and have electrodes. The insulating partition is mounted in the socket and has a cavity and at least one stopper formed in the cavity. The leaf spring is mounted in the insulating partition, is V shaped, is held in place by the stopper and protrudes through a top of the insulating partition to selectively and respectively contact the electrodes. The bulb assembly is removably plugged into the socket and has a separator. The separator pushes the leaf spring into the insulating partition to stop the leaf spring from contacting the electrodes. When the bulb assembly is removed from the socket, the leaf spring returns to an original shape by resilience to contact the electrodes.

Abstract: A decorative light string has a power connector, at least one lightening unit and a rectifier. The lightening unit is electrically connected to the power connector and has an incandescent bulb set and an LED set. The incandescent bulb set has a primary wire and multiple incandescent bulbs. The LED set has a secondary wire and multiple LEDs. The incandescent bulbs and LEDs are respectively electrically connected to the primary and the secondary wire. The secondary wire is electrically connected and intertwined with primary wire. At least one of the incandescent bulbs of the incandescent bulb set is placed between each two of the LEDs. The rectifier is electrically connected the power connector and each LED set in series. The decorative light string has an advantage of preventing snow to veil LEDs by the heat from the incandescent bulbs when used in the snows.

Abstract: A lamp for a light string has a socket, multiple electric cords, an insulating partition, a leaf spring and a bulb assembly. The electric cords are mounted in the socket and have electrodes. The insulating partition is mounted in the socket and has a cavity and at least one stopper formed in the cavity. The leaf spring is mounted in the insulating partition, is V shaped, is held in place by the stopper and protrudes through a top of the insulating partition to selectively and respectively contact the electrodes. The bulb assembly is removably plugged into the socket and has a separator. The separator pushes the leaf spring into the insulating partition to stop the leaf spring from contacting the electrodes. When the bulb assembly is removed from the socket, the leaf spring returns to an original shape by resilience to contact the electrodes.

Abstract: A lamp for a light string includes a V shaped spring with two ends movably received inside the passage of the socket to selectively engage with two connecting plates of two cables so as to maintain electrical engagement between the two connecting plates when the light bulb is removed from the passage of the socket.