Thomas Edison is credited with creating the first strand of electric Christmas lights in 1880, and his colleague Edward H. Johnson created the first electric Christmas tree lights in 1882. Later, Albert Sadacca helped turn Christmas lights into a mass‑market product in the 1910s, making them popular for ordinary households.

Who “invented” Christmas lights?

The answer is really a small cast of characters rather than one lone genius.

  • Thomas Edison : In 1880, he strung the first known strand of electric lights outside his Menlo Park laboratory during the Christmas season, effectively inventing the concept of electric decorative lights. Passing train passengers saw what was, for its time, a dazzling holiday light display.
  • Edward H. Johnson : In 1882, Johnson hand‑wired 80 tiny red, white, and blue bulbs and wrapped them around his parlor Christmas tree, creating the first documented electrically lit Christmas tree. The tree even rotated, turning the display into a kind of Victorian light show.

From dangerous candles to safe strings

Before electric lights, people balanced real candles on Christmas tree branches, which was beautiful but also a serious fire hazard.

  • Families used melted wax or small metal holders to fix candles to the tree, and fires were common enough that candles might only be lit briefly under supervision.
  • Johnson’s electrically lit tree showed a safer, more controllable way to get that same warm glow without the constant fear of the house catching fire.

How Christmas lights went mainstream

Even after Edison and Johnson’s experiments, electric Christmas lights were rare and expensive for decades.

  • Albert Sadacca : In 1917, teenage Albert Sadacca proposed selling affordable, colorful Christmas light strings through his family’s novelty lighting company. By the 1920s, he and his brothers helped form NOMA, a company that dominated the Christmas‑light market until the 1960s, pushing lights into ordinary homes.
  • Early sets were hand‑wired and fragile, but over time they became cheaper and safer, eventually evolving into the familiar mini‑bulbs, LEDs, and synchronized displays seen today.

Mini timeline of Christmas lights

  1. 1800s: Christmas trees lit with candles, causing many household fires.
  1. 1880: Thomas Edison displays the first strand of electric decorative lights at Menlo Park.
  1. 1882: Edward H. Johnson debuts the first electrically lit Christmas tree with 80 colored bulbs.
  1. 1890s–early 1900s: Electric lights appear in store windows and public displays but remain a luxury.
  1. 1917–1920s: Albert Sadacca and NOMA commercialize affordable Christmas light sets for the public.

Today’s view: Who gets the credit?

Different sources emphasize different people when answering “who invented Christmas lights.”

  • Many historians name Thomas Edison because he created the first decorative electric light strand and made the leap from simple bulbs to festive display.
  • Others highlight Edward H. Johnson as the true “Christmas lights” inventor since he first used strings of electric lights on a Christmas tree—what people usually picture when asking this question.
  • Business and design historians also point to Albert Sadacca as the one who turned a clever novelty into a global holiday tradition through mass‑market production.

TL;DR: Edison built the first electric light strand, Johnson wrapped it around a Christmas tree, and Sadacca helped put Christmas lights into everyone’s homes.

Information gathered from public forums or data available on the internet and portrayed here.