A fact from Spectra (installation) appeared on Wikipedia's Main Page in the Did you know column on 9 August 2014 (check views). The text of the entry was as follows:
Did you know... that spectra, London's giant tower of light (pictured), will be turned off on Monday?
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The supporting citation states, "Spectra was commissioned by the Mayor of London and 14-18 NOW (First World War Centenary Art Commissions)." This source is a reliable one and is supported by others such as The Guardian which states, "Spectra was commissioned by the Mayor of London and 14-18 NOW (WW1 Centenary Art Commissions) as the centrepiece of its artistic commemoration of the start of the war." Presumably, other people have commissioned similar installations in other places for other occasions. The article might usefully be expanded to include such details but this will not be achieved by disputing the plain facts which we already have. Andrew (talk) 15:30, 10 August 2014 (UTC)Reply
If you look at the telegraph.co.uk source it makes it clear that it is the Artangel project that was co-commissioned by the Mayor of London not Spectra. Spectra has exited in other cities before it came to London. LGAtalkedits21:26, 10 August 2014 (UTC)Reply
The ryojiikeda site is not fully definitive because it does not yet include details of the London installation. At the London installation, there were explanatory leaflets at the site. In the credits, the leaflet states, "Produced and presented by Artangel. spectra is co-commissioned by Mayor of London and 14-18 NOW, WW1 Centenary Art Commissions." The ryojiikeda site indicates that the similar installations in other cities were commissioned by bodies associated with those cities. For example, the installation in Barcelona was "commissioned by Grec festival and Sonar, 2010". That installation was not the same as the London one, as it had 63 searchlights not 49. Each installation seems distinct in having different configurations and different sound. The focus of the article is currently upon the London installation and it seems incontravertable that the Mayor and 14-18 NOW commissioned it. As and when we cover the other installations in similar detail, then we can list their corresponding commissioners too perhaps. In the meantime, I'm not seeing the point of this dispute when we have such clear sourcing in support of the article's text. Andrew (talk) 23:27, 10 August 2014 (UTC)Reply
I think that is what the article says now? I agree, each one is different and separately paid for, but they are all clearly versions of the same idea as reflected in the source. It makes sense to have one overarching article with sections for each version rather than separate articles. Philafrenzy (talk) 07:59, 11 August 2014 (UTC)Reply