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TikTok shocked to learn what the red Christmas light is really for

Decking the halls just got a little brighter

The little red-nosed bulb that comes with strings of holiday lights has an unassuming function people are just now discovering, thanks to a “revelation” on TikTok. A woman shared a video demonstrating how the little red light is actually intended to make other lights glimmer. 

“I was today years old when I found out what these are for,” the light scholar, who goes by the handle @VizNelly on TikTok, captioned the illuminating video. 

First, she removes a single bulb from a string of lights and replaces it with the red one in the clip, which has more than 19 million views. 

“Wait for it,” she says, building up the holiday hype. Then, the strand of lights start flickering, the festive DIY video shows. 

The TikToker posted a photo demonstrating how to use the little red bulb found in holiday light packages. TikTok / viznelly

Viewers were shocked — with many thinking the little red bulb was simply a spare, should one light stop shining. 

“I thought they were replacement bulbs if one burnt out,” one commenter wrote of the blinking lights. 

The red light bulb found packaged with Christmas lights has a bright function many are just now discovering. TikTok / viznelly

Another user by the name Lina Scanelli scoffed: “Dude, all they had to do was write something somewhere on the box. I wasted so many years not knowing this.” 

After removing a regular bulb on a string of holiday lights, replace it with the red-nosed bulb for a blinking light effect. TikTok / viznelly
The string of Christmas lights will start flickering once the red bulb is screwed in. TikTok / viznelly
Viewers were shocked by the Christmas red light holiday hack for twinkling lights. Getty Images

Some had a jolly old take on what the red bulb was for.

“I thought it was a little Rudolph nose bulb … the special bulb,” another responded.

Despite the enlightening revelation for many Gen Zers, some viewers were quick to point out the discovery is nothing new.

“As someone who grew up in the 90s … I thought everyone knew this. We didn’t always have remote control lights!” the elder millennial chimed in.