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PostPosted: Mon Sep 30, 2019 4:34 am 
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The newer lanterns will be the most efficient.

However, that usually doesn't have anything to do with it, it depends what is available at the time. In 2013, the Axia 2 wouldn't have been available for instance.

Replacement of one LED lantern with another generally doesn't happen en masse. It may happen if older lanterns are the odd casual replacement for discharge lighting, and then a mass LED replacement comes along and the old LED lanterns don't have CMS nodes for instance.


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PostPosted: Wed Feb 05, 2020 7:24 am 
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Portsmouth in Hampshire,  has been converting the majority of its lighting from SON Iridiums using magnetic gear, installed by the PFI in the first decade of the 2000s, to LED. In 2018 a trialwas conducted into dimming the new LED lighting to further reduce energy consumption.

It was announced in the media today, that dimming will now be rolled out across the city (for installations that are dimming capable), although the city centre will not be dimmed "for fear of increased crime levels".


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PostPosted: Sat Dec 12, 2020 8:47 pm 
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The last couple of decades have seen considerable changes to street lighting, but the 2020s is likely to see an acceleration of what already started in the 2010s. In the 2000s, it was the PFI that was responsible for wholesale replacements. However, as dramatic as those were, they are nothing in comparison to LED replacements that have started happening over the past few years. Indeed, lots of areas that have had PFIs have not escaped significant upgrade to LED, and unlike PFIs, major LED roll outs have been much more nationwide in reach. It's a pace of change that I don't think any of us could have comprehended a few years ago.

The 2020s is going to be another milestone decade in my mind. With the pace of change that is happening, I wouldn't mind betting that by the end of the decade that the majority of discharge street lighting will have been eradicated, including the likes of SON, compact fluorescent and CosmoPolis. Something that recent replacements have taught me is that nowhere is safe, and lighting stock being relatively new is also not grounds for being safe. LED has established itself firmly as being the most energy efficient way of lighting a street. Bye bye discharge lighting.


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PostPosted: Tue Dec 15, 2020 6:08 pm 
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The electricity supply industry heavily penalises commercial/industrial users during the peak time of 1630-1900, during 1st Nov -28th Feb.

My employer - which is largely office based, normally pays around 9pence per Kwh, but during peak times, this rises to between £30 to £55 per Kwh in the early eve peak time.

Extrapolate to tens of thousands of streetlights, then this charge alone would justify the move from discharge lighting to LED.


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