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Wales' return to Principality Stadium didn't go as planned as they were trounced 4-1 by Spain in an international friendly.

It was the first time Wales had played at the 74,500-seater venue since losing to England in March 2011, and midway through the second half, tensions arose between the Wales fans.

A large number of supporters around the stadium lit up the arena with their mobile phones, prompting angry chants from certain members of the Red Wall - Wales' hardcore supporters.

Here's how the situation unfolded and what the fans had to say about the events.

What was the 'light show'?

Shortly after the hour mark (with Wales trailing 3-0), fans around the ground started holding up their phones with their lights on display.

Slowly but surely, more and more supporters followed suit, and within a minute or two the stadium was illuminated with the glow from the handheld devices of fans.

But a large section of supporters behind one goal - the end Wales were attacking in the second period - refused to join in, even turning on those who did hold up their mobile phones.

Chants of "What the f****** hell is that?" were followed by "Where were you when we were s***?".

Matters on the pitch appeared meaningless at this stage, with Giggs' men already staring down the barrel of defeat against superior opposition.

And an unpleasant animosity rapidly shrouded what was meant to be a demonstration of Wales' ability to progress under their new boss.

Ironically, it had all started rather well with an impressive rendition of the Welsh anthem, which you can watch below.

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What did the fans say?

The response from fans on social media was mixed to say the least.

Is it wrong for hardcore Wales fans to belittle the more fair weather supporter?

Some may argue that many of those who were in attendance for the defeat to Spain were merely "day trippers" or those who weren't there during the "bad times".

It's also worth stating the "light show" was a slightly odd thing to witness at a football match.

Remember, this all comes against a backdrop of loyal Wales fans fearing a long term return to the larger Principality Stadium would blow apart the unique atmosphere that's been created at Cardiff City Stadium in recent years.

But the whole reasoning behind staging the game at what is the home of Warren Gatland's rugby side was merely to test the water in a bid to see whether or not competitive games could be held there in the future.

Would there be enough fans? Would Wales benefit from playing there?

There were plenty of factors.

And there was also an emphasis on providing those who would usually miss out on the opportunity of seeing Gareth Bale & co. with the chance to see their heroes in action against the big guns of Spain at a significantly larger venue than Cardiff City Stadium.

Of the 50,232 in attendance against the 2010 World Cup winners, around 13,000 were youngsters who were most likely not even old enough to witness the dark days of Slovakia in 2006 or Finland in 2009.

To level any glory hunting tag on that particular generation seems incredibly unfair, or just plain wrong, especially when you consider these are the supporters who will look up to the likes of Ethan Ampadu, David Brooks and Harry Wilson in the future.

So whichever side of the fence you're on with regards to where Wales' true home lies, the FAW's efforts to capitalise on the opportunity that arose to grow the Red Wall shouldn't be derided.

So what do the facts say?

Wales went into their 2018 World Cup qualifying campaign with huge expectations resting on their shoulders.

Bale and his fellow Euro 2016 heroes had taken the national side to the semi-finals of a tournament for the first time in the country's history, and Wales were riding the crest of a wave as they prepared to welcome the likes of Moldova, Georgia and Serbia to the Welsh capital.

Tickets to home matches were like gold dust, and Cardiff City Stadium played host to some truly special atmospheres, although it ultimately ended in heartbreak for Chris Coleman's side as they were beaten in their final qualifier against Republic of Ireland.

And just under a year later as Wales tore the Emerald Isle to shreds in their inaugural Nations League encounter, there were approximately 8,000 empty seats at the home of Neil Warnock's Bluebirds.

Granted, the game was on a Thursday night which makes travel - particularly for those in North Wales - difficult while the younger generation have education to prioritise.

But Wales' attendance against Spain - in what was a friendly fixture - was almost exactly double that of the competitive game against Martin O'Neill's side a month ago.

Surely that's proof enough that the Principality Stadium move was a gamble worth taking - whether you believe it was a success or a failure - at the very least.