Faulty Friday night lights have caused a slight delay to the Sydney Swans and Greater Western Sydney clash in the third week of the NAB Challenge.

Players from both sides had gone through their pre-game warm-ups at Drummoyne oval in Sydney's inner west, but were forced to keep themselves busy when five of the ground's six light towers were not working.

The umpires retreated to their changerooms when the 7.10pm kick-off time came and went, but the players stayed put and went through some extra work on the ground in front of a healthy crowd.

Thankfully for the fans and both sides, the game eventually got underway at 7.25pm, just 15 minutes late.

The Swans weren't too bothered by the commotion with star midfielder Josh Kennedy nailing the game's opening goal inside the first minute.