TL;DR: Christmas lights evolved from open candle flames on live trees -- a tradition that regularly burned houses down -- to electric strands pioneered by Thomas Edison and Edward H. Johnson in the 1880s. Henry Diek of Baltimore patented an illuminated Christmas tree light system in 1892, predating widespread public adoption by more than a decade. Original patent prints are available framed or unframed.
Before electric Christmas lights existed, families brought live trees into their homes and fastened real candles to the branches. The candles were lit on Christmas Eve and watched carefully by an adult standing nearby with a bucket of water or sand. House fires were a reliable annual consequence. The tradition of illuminating the Christmas tree was so beloved that generations of families accepted the risk rather than abandon it.
The introduction of electric lighting in the 1880s offered a safer path, though one that took decades to become affordable. The story of how a single strand of electric bulbs became the defining symbol of the American Christmas involves an inventor who never bothered to commercialize his work, a president who used the White House to advertise the idea, and a patent for an illumination system so dangerous it was arguably worse than candles.
Candles on Trees: A Tradition Built on Fire Risk
The practice of decorating evergreen trees during winter festivals predates Christianity in Europe, but the specifically German tradition of the decorated Christmas tree with candles took hold during the 16th and 17th centuries. Martin Luther is credited in popular legend with adding candles to a tree to recreate the starlight he had seen shining through forest branches, though the historical evidence for this story is thin.
What is well documented is that by the 18th and 19th centuries, candle-lit Christmas trees were a fixture in German households and had spread throughout the German-speaking world. When German immigrants brought the tradition to Britain and the United States, the candles came with it.
The fire risk was serious and widely known. Insurance companies in the late 1800s tracked Christmas tree fires as a distinct category. The trees were cut weeks before the holiday, dried out in heated homes, and then decorated with open flames. Families improvised various safety measures: tin holders to catch dripping wax, buckets of water kept nearby, and strict rules about never leaving a lit tree unattended. None of these measures eliminated the danger. They simply managed it.
The solution, when it came, arrived not from a safety reformer but from an inventor looking for ways to demonstrate the commercial potential of electricity.
Thomas Edison and the First Electric Strand
In 1879, Thomas Edison demonstrated the practical incandescent light bulb at his laboratory in Menlo Park, New Jersey. The invention had immediate industrial applications, but Edison understood that public acceptance required public spectacle. He was an instinctive showman as much as an engineer.
In December 1880, Edison strung electric lights along the outside of the Menlo Park laboratory complex, making it visible to passengers on the passing railway line. It was the first public display of electric lights used as decoration rather than illumination, and it attracted significant attention. The connection between electric light and the Christmas season was established in that first display, though it would take years for the idea to enter private homes.
The electricity infrastructure required to power such lights simply did not exist in most American homes in 1880. Edison's display ran on generators at the lab. For ordinary households, electric Christmas lights remained a curiosity rather than a practical option.
Edward H. Johnson and the First Electric Christmas Tree
The first documented use of electric lights on an indoor Christmas tree came two years later, in 1882, and the man responsible was Edward H. Johnson, a close associate of Edison and a vice president of the Edison Electric Light Company.
Johnson hand-wired 80 light bulbs, coloring them red, white, and blue, and wound them around a Christmas tree in his New York City apartment on Fifth Avenue. He then put the tree on a rotating stand so that visitors could see it from every angle. A reporter from a Detroit newspaper was invited to observe and wrote about the display in terms that conveyed something close to astonishment.
The reaction from the general public was more complicated. Electricity was widely distrusted in the 1880s. It was invisible, poorly understood, and associated with electrocution accidents that received sensational coverage in the press. Many people who heard about Johnson's electric tree assumed it was a novelty stunt from someone trying to sell them something dangerous. They were not entirely wrong: Johnson was, in fact, trying to demonstrate the commercial appeal of electric lighting. But the distrust was real, and it delayed mass adoption by years.
The White House Tree and General Electric's Kits
The public's wariness toward electric Christmas lights began to shift in the mid-1890s, pushed in part by a presidential endorsement. In 1895, President Grover Cleveland decorated the White House Christmas tree with electric lights, a gesture that carried significant symbolic weight. If the executive mansion was willing to illuminate its tree with electricity, the technology could not be as dangerous as rumored.
The remaining obstacle was cost. In the 1890s, having an electrically lit Christmas tree required hiring a wireman to install the lights, renting the generator or having a direct electrical connection, and paying for the bulbs themselves. The total expense could run to what would be several thousand dollars in today's terms. Electric Christmas lights were, for the first decade of their existence, a luxury product available only to wealthy households.
That barrier began to come down in the early 1900s when General Electric began offering pre-assembled Christmas light kits for consumer purchase. Rather than requiring custom wiring and professional installation, homeowners could now buy a string of lights, plug it in, and hang it on their tree. The kits were still expensive by working-class standards, but the price fell steadily through the first two decades of the 20th century. By the 1920s, electric Christmas lights had become widely accessible, and the candle-on-the-tree tradition began its long retreat.
Henry Diek's 1892 Patent: The Strange Safety Compromise
Three years before Cleveland lit the White House tree, a Baltimore inventor named Henry Diek filed a patent for a Christmas tree illumination system. Granted in 1892, Diek's patent described a device that used gas burners rather than electric bulbs, essentially a scaled-down system of the same gas lighting technology used in streetlamps and domestic fixtures at the time.
The design reflected the moment in which it was filed. In 1892, electric lighting was still largely inaccessible to ordinary households, and gas was the dominant artificial light source in American cities. Diek's system was, in its own terms, an attempt to replace candles with something more controlled: contained gas flames rather than open wicks.
The practical problem with Diek's design was that it exchanged one fire risk for another. Contained gas flames on a dry Christmas tree still represented a significant hazard. The patent expired in 1909 without generating a commercially successful product, overtaken by the electric lights that were becoming more affordable just as it lapsed.
What the Diek patent captures is a specific moment in technological transition: the period when inventors knew candles were a problem, electric lighting was the theoretical solution, but the infrastructure for electric lighting had not yet reached ordinary homes. Diek's gas system was a bridge technology that the market never needed, because the electric alternative arrived before the bridge could be built.
From Luxury to Universal Tradition
The transformation of Christmas lights from an expensive curiosity to a nearly universal American tradition happened across roughly four decades, from the 1880s through the 1920s. Each step required a combination of technological improvement, cost reduction, and cultural endorsement.
Edison's 1880 demonstration established the visual idea. Johnson's 1882 tree proved it could work indoors on a decorated tree. The growing electrical grid in American cities during the 1890s made the necessary infrastructure increasingly available. The White House tree in 1895 provided a prestigious endorsement. General Electric's consumer kits in the early 1900s brought the price within reach of the middle class. And by the 1920s, electric Christmas lights had become affordable enough that families who had grown up with candles were replacing them with plugged-in strands.
The patent Diek filed in 1892 -- for a gas-powered system that never sold -- sits at the center of this transition. It is a document of the problem that electricity solved.
Frequently Asked Questions
Who invented Christmas lights?
Thomas Edison created the first strand of electric lights displayed outdoors at his Menlo Park laboratory in 1880. Edward H. Johnson, Edison's business partner, used electric lights on an indoor Christmas tree for the first time in 1882 at his New York City apartment, hand-wiring 80 red, white, and blue bulbs. Neither filed a specific patent for Christmas lights; the technology evolved from the general electric light industry.
When did Christmas lights become common in American homes?
Electric Christmas lights became widely accessible after General Electric began selling pre-assembled kits in the early 1900s. Before that, having electric lights on a Christmas tree required professional installation and was extremely expensive. By the 1920s, prices had fallen enough for middle-class families to afford them, and the tradition of candles on trees began to fade.
What was Henry Diek's Christmas light patent?
Henry Diek of Baltimore, Maryland was granted a patent in 1892 for a Christmas tree illumination system that used gas burners rather than electric bulbs. The design was intended as a safer alternative to open candles, but the gas system still posed significant fire risks. The patent expired in 1909 without producing a commercially successful product, as affordable electric lights made it obsolete before it could reach the market.
Why did families use candles on Christmas trees if it was dangerous?
The candle-lit Christmas tree tradition, imported to the United States from Germany during the 19th century, was deeply embedded in holiday culture before electric alternatives existed. Families developed safety protocols -- keeping water nearby, using holders that caught dripping wax, never leaving lit trees unattended -- to manage the risk rather than abandon the tradition. House fires caused by Christmas trees were common enough that insurers tracked them separately.
When did President Cleveland put electric lights on the White House Christmas tree?
President Grover Cleveland decorated the White House Christmas tree with electric lights in 1895, making it one of the most prominent public endorsements of electric Christmas lighting in the United States. The gesture helped shift public perception of electric lights from a dangerous novelty to a legitimate and desirable technology.
Written by Rider Tuff, founder of Timeless Patents. Timeless Patents makes museum-quality patent art prints from original U.S. Patent Office documents, celebrating the inventors behind your favorite traditions and everyday objects. Every print is available framed or unframed, starting at $49.99. Shop the full holiday collection →
Cover image: "Christmas Lights" by Bret Schwalb, licensed under CC BY 3.0, via Wikimedia Commons.
