Upon its release in 1989, National Lampoon’s Christmas Vacation became an instant classic. One of the most iconic images from the movie is the family home lit up with 25,000 lights. Clark Griswold’s over-the-top light display infuriates the neighbors and briefly blacks out the entirety of Chicago, but what impact does it have on the Griswold’s finances?

Clark boasts that he’s got 250 strands of lights with 100 bulbs each, totaling 25,000 lights. The average price of electricity in the United States today is $0.1632 per kilowatt hour. Some quick research tells us that a 100-bulb strand of C9 lights (the type used in the movie) uses 700 Watts of electricity to operate. If the Griswolds were to run their light display 10 hours a day for 30 days, it would add a whopping $8,570 to their electric bill!  

Unfortunately for Clark, LED Christmas lights didn’t come on to the market until 1998. Using only 4.8 Watts per strand, as opposed to the 700 Watts an incandescent strand uses, they are a far more economical choice for holiday décor. If Clark had been able to use LED’s, the same light display would only cost the family a mere $58.75.

The moral of the story is this- replacing your old incandescent lights with LEDs is worth it. Make your celebration memorable, not your electricity bill.

If you’re interested in finding out how much your own light display will cost, you can use this handy calculator to estimate it.