What Makes Christmas Lights Twinkle

Twinkling sets also use a lot of bimetallic strip bulbs – typically every fifth bulb has a strip. The result of the bulbs being shorted out is that all be the bulbs in set see a higher voltage. This makes the entire strip shimmer in time with the flashing. That’s where the twinkling magic comes from.

How can I get my Christmas lights to twinkle?

Short answer. Yes, just replace one of the bulbs in your Christmas light string with a red-tipped bulb and that section of circuit will flash on and off!

How do you make LED Christmas lights twinkle?

Find the extra LED lights that you have set aside and find the one with a red mark on the end. This is the light that will make the string of lights blink. Place this bulb in the first section of the string of lights. Notice if there is a place on the string where the lights stop blinking.