The sphere was measured at 10.33m, covered in 2,500 mirrored tiles and filled with 350 cubic metres of air.
The idea behind the installation came from guitarist and Bestival performer Nile Rodgers from the disco band Chic. Festival directors Rob and Josie da Bank enlisted the help of Newsubstance to create a disco ball larger than the previous record of 9.98m.
Official Guinness World Record adjudicator Mark McKinley confirmed the size before it was raised and spun to form a light show as Chic closed the show on Sunday evening.
Rob Da Bank said: "We love a challenge at Bestival, so when Nile Rodgers asked us to do something spectacular we knew it had to be beyond amazing. We don’t do things by halves, we get immersive and take them head on, so we’re very proud to have cracked the world record.
"Our Desert Island Disco has been utterly incredible, and to top it all off with the Guinness World Records title for the Largest Disco Ball is the best feeling ever."
Mungo Denison, project manager at Newsubstance, added: "It’s taken the team three months of blood, sweat and mirror tiles to design and fabricate this gigantic beast. It’s been a fantastic journey."
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