The invention relates to an improved structure of a decorative light string, which includes an electrical wire to connect with many bulb assemblies for decorative lighting. Each bulb assembly includes a light bulb holder (3) with a dint (31) to receive a LED bulb (4) and a base (2) with a dint (21) to receive the holder (3) together with the LED bulb (4) under a corrective direction. By use of the invention, the light string lights without high heat and prevent from any accident of fire and damage.
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