The couple, from Forest Act, Australia, have 331,038 lights covering their property.
David Richards, a barrister and father of three, has been working for the past four years to bring together all the decorations.
The illuminations have helped to raise money for the charity SIDS and Kids - an organisation Mr Richards said helped his family during tough times in 2002.
A family has shot into the Guinness Book of Records after setting a new record for the largest number of Christmas lights.
David and Janean Richards, from Australia's capital Canberra, decorated their home with an astonishing 331,038 different lights.
They are hoping to use the new-found fame of their house to raise money for charity.
In order to break the record, which is to be included in Guinness World Records for the first time following the Richards' success, they were told they would need at least 250,000 lights.
The display had to be turned on for at least 10 minutes, and filmed in a video sent off to London for verification.
Following the switch-on ceremony earlier this month, the family has now been declared the official record-holders.
The annual Christmas display has been growing ever larger since Mr Richards started it four years ago, and this year's show required hundreds of hours of work.
In the end it included more than 18 miles of lights, as well as 15,000 cable ties and a 60ft Christmas tree at its centre.
'I did it for my kids initially and then it just got bigger and bigger,' Mr Richards told the Canberra Times.
'I remember one year a mother and child came through the driveway thinking no one was around and they started dancing to the music - it's all about putting a smile on people's faces.'
The display is being used to raise money for SIDS and Kids, a charity which aims to reduce mortality among infants and new mothers.
Mr Richards, who refuses to tell anyone - including his wife - how much the lights cost, says this year is the last in which he will put up the record-breaking display.
He plans to pass on the lights to someone else who wants to fundraise for SIDS and Kids.