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PostPosted: Tue Nov 10, 2009 5:04 pm 
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Some of you guys may have recently spotted this item on BBC News about Bolton Council's plans to slash its energy bill with dimming, LEDs and trimming a few minutes off each end of the night by changing the sensitivity of the photocells. A look around the Bolton Council web site revealed this fascinating document (NOTE: this document will open as a Microsoft Word document).

Well, I certainly found it fascinating, because here in Essex we are still heavy users of SOX, and SON is seen as the way forward! CPO and LED is all Greek to me, and I think I'll be an old man before I see any new technology like that around here!


Last edited by David on Mon Oct 09, 2017 12:55 pm, edited 2 times in total.

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PostPosted: Tue Nov 10, 2009 5:04 pm 
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Hampshire is looking at compact fluorescent, trimming, and part night operation or dimming as part of the PFI relighting in the county. Already, casual replacement 36w PL-L Urbis Altras only consume around 36w of power in total, which is much less than the circuit wattage of 35w SOX and 50w SON, plus they switch on later and switch off earlier, made possible by the rapid warm up of compact fluorescent giving near full output just after switch on. Plus, 36w PL-L is perceivably brighter than 35w SOX, even though on paper it is much dimmer.

Originally Posted: 12-10-2009, 06:33:15 pm


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PostPosted: Tue Nov 10, 2009 5:05 pm 
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If only more councils acted like Bolton and PFI schemes were specified as Hampshire is (Surrey is also specifying a similar policy to Hants for their upcoming PFI) then unnecessary over lighting and energy wastage could be avoided. It makes a mockery of PFIs like Portsmouth which is just about complete yet has specified blanket SON over the entire city with magnetic gear, no dimming what so ever and unreliable 70 and 100 Lux cells which are already dayburning.

Originally Posted: 12-10-2009, 06:52:25 pm


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PostPosted: Tue Nov 10, 2009 5:06 pm 
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Quote:
"This will involve removing the old-style lanterns and replacing them with LED lamps in more than 300 locations around the borough."


- looks like some lanterns may be up for grabs around Bolton soon...



Anyways, York is already on a course of energy savings. The main shopping street used to be lit with 250w SON, but is now lit with either 100w or 150w CDM lamps (I thought it was CPO but they haven't yet started using those, but there is a trial planned).

Also, the new development is replacement of the mercury stock in the city. pretty much every 80w MBF lantern will be replaced with a 42w CFL Thorn Jet. Haxby and Wigginton areas are next on the cards, and once those areas have had the lighting changed then it will be a very different place, as the area marked by the York Road to the east and the B1363 to the west is 90% mercury lit.

Originally Posted: 13-10-2009, 01:43:36 am

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PostPosted: Tue Nov 10, 2009 5:07 pm 
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LED lighting policy is a peculiar one. Southampton installed some LED street lighting, and even though each lantern consumes 45w the light output is noticeably dimmer than any other street lighting in the city, including 42w PL-T lanterns, which consume about 42w in total and are at least 50% brighter, and 45w CosmoPolis, which consumes about 52w in total and is over 100% brighter. Yet, the council seems reluctant to light residential streets nowadays with anything less than 60w CosmoPolis. 42w PL-T has gone out of fashion, as has 35w CDM-T, and 45w Cosmo is not used anywhere near as much as 60w Cosmo. Just being sensible with existing lamp types would save a significant amount of energy. Yet, when it comes to lighting levels, a different approach seems to be taken. It's as if "because it's LED" that other factors like how many lumens per watt the lighting produces go out of the window.

Where Southampton's 45w LED is relatively close together the lighting levels are alright. However, 36w PL-L would provide brighter white lighting at larger spacings and reduced power consumption. There was the 36w PL-L Libra trial in Southampton, but that lasted a couple of months before the 36w Libras were replaced with 60w CosmoIridiums  :x

Originally Posted: 20-10-2009, 08:27:00 pm


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PostPosted: Tue Nov 10, 2009 5:07 pm 
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Wiltshire have started using LED for signlighting. I have to say it is quite effective (but the unit looks too long as it sticks diagonally down above the sign) I think it is good for sign lights, but not too sure for street lights at this stage. I still think SOX or any type of CFL/PL-L is better from a power consumption perspective.

Originally Posted: 20-10-2009, 09:04:58 pm

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PostPosted: Tue Nov 10, 2009 5:08 pm 
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sotonsteve wrote:
LED lighting policy is a peculiar one. Southampton installed some LED street lighting, and even though each lantern consumes 45w the light output is noticeably dimmer than any other street lighting in the city, including 42w PL-T lanterns, which consume about 42w in total and are at least 50% brighter, and 45w CosmoPolis, which consumes about 52w in total and is over 100% brighter.

...this is what puzzles me about Bolton Council's decision. They are changing their current policy of 45w CPO (I assume that means CosmoPolis!) spaced at 24 metres / mounted at 5 metres to 18w LED lanterns spaced at 26 metres / mounted at 5 metres.

It will be years before LED, or even the new breed of fluorescent lighting reaches Colchester (we still like our 35w SOX, and 70w SON near the middle of town!) so I cannot guess how efficient an 18w LED lantern would be. But the sheer drop in wattage rings alarm bells for me, especially for white light (the efficiency of which has historically lagged behind non-white light).

A particularly troublesome housing estate in Clacton recently had its lighting changed from 35W SOX to Phosco P700s sporting white light (presumably the 35w CDM), but the few 35w SOX casual replacements that have already sprung up on the estate seem to be brighter than their CDM neighbours. This could be a trick of the light however - the SOX casual replacements are the traditional non cut-off type, can be seen from the end of the road and illuminate the surrounding houses, whereas the P700s are cut-off and only illuminate the patch of road under the column.

Surely 18w LED, no matter how well directed, would be really dim?

My brother's Royal Air Force base recently had its Beta 2s replaced with LED lanterns, but I have not had the opportunity to view them at night yet!

Originally Posted: 20-10-2009, 11:18:06 pm


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PostPosted: Tue Nov 10, 2009 5:08 pm 
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Here are some figures for the WRTL Stela:

10 LED - 14W - 950 lumens
14 LED - 22W - 1330 lumens
18 LED - 26W - 1710 lumens
36 LED - 52W - 3420 lumens
52 LED - 70W - 4940 lumens

WRTL suggest the 18 LED version to be a replacement for 36W PL-L. 36W PL-L produces 2900 lumens. I will freely admit that lumens aren't everything, and that even though 36W PL-L only produces 2900 lumens that it seems as bright as 35W SOX with around 4500 lumens. However, comparing LED with CFL is comparing white light with white light. The Southampton LED installations each produce 2000 lumens, and I can assure you, it isn't as bright as 36W PL-L.

Originally Posted: 21-10-2009, 07:17:58 am


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PostPosted: Tue Nov 10, 2009 5:10 pm 
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I dont know the name of these lights but they are LED (a cluster of approimately 36 LEDs) Kirklees council have installed about 5 of these in Lepton, near to Huddersfield; it's on the 231/232 route operated by hudds bus co.

Originally Posted: 22-10-2009, 05:20:28 pm

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PostPosted: Tue Nov 10, 2009 5:12 pm 
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I thought I would add a picture of the LED lanterns on my brother's RAF base. I knew I had one somewhere!

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Each one has 48 LEDs, is mounted about 5 metres off the ground and replaced a 55w Beta 2. The label offers no clue as to its manufacturer, not even a wattage! The label (near the pavement end of the lantern) says:
Part No: J48 - 4 - 2A - B1
Serial No. 0280 / 0209
Supply: 230V AC
Freq.: 50Hz
Fuse size: 2A


Last edited by David on Mon Oct 09, 2017 12:57 pm, edited 2 times in total.

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