Rugby goal-light technology trial at Principality Stadium - BBC News
The posts lit up to show whether a kick went over at Saturday's Judgement Day double-header.
The technology was trialled in the Pro 14 Welsh derby showpiece in Cardiff

New technology to light up rugby posts in different colours to show whether a kick is successful was trialled at Cardiff's Principality Stadium.

Goal-light technology was used for the first time in the UK at the Welsh Rugby Union's annual Judgement Day event on Saturday.

The Welsh company behind the technology hopes it could also revolutionise other sports such as American football.

However some fans have branded it a "waste of time".

Similar to how wickets light up in 20/20 cricket, some 500 LED lights on each rugby post are activated by remote control.

This video can not be played To play this video you need to enable JavaScript in your browser. How does the new technology work?

The lights show green if the penalty, conversion or drop goal is successful - or red if not.

It was successfully trialled earlier this month by World Rugby at the Hong Kong Sevens.

Inventor Michael Press, 33, said he believes the technology adds to the match-day experience of fans as well as aiding visually impaired spectators.

"Stadiums keep getting bigger and spectators are further away from the action so this technology is about giving everyone the same experience," he said.

"Stadiums are also changing, with giant screens, better seating, banners and entertainment, but no-one has changed things on the pitch."

This Twitter post cannot be displayed in your browser. Please enable Javascript or try a different browser. View original content on Twitter The BBC is not responsible for the content of external sites. Skip twitter post by Jamie Roberts This article contains content provided by Twitter. We ask for your permission before anything is loaded, as they may be using cookies and other technologies. You may want to read Twitter’s cookie policy, external and privacy policy, external before accepting. To view this content choose ‘accept and continue’. The BBC is not responsible for the content of external sites.

A custom-made wrap - lined with the bulbs - fits around the posts and crossbar.

It was used at the WRU's Judgement Day event where Cardiff Blues take on Ospreys after Scarlets faced defeat by the Dragons in the Guinness Pro14 league.

However there are not yet plans to use it again at the venue.

Goal Light Tech managing director Michael Press was inspired by the growing size of sporting stadia

The company said the technology has also gained interest from other sports such as Gaelic football, hurling and rugby league.

"A lot of thought went into making the technology as simple as possible," said Mr Press.

"As soon as the touch judges raise their flags then we fire up the lights."

One operator uses an encrypted remote transmitter to light up the posts

Mr Press is a former schoolmate of former British & Irish Lions and Wales rugby international Jamie Roberts.

However not everyone is convinced.

Some fans who responded to Roberts' tweet said the technology was unnecessary while others said it would help those with certain types of colour-blindness.