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PostPosted: Thu Aug 18, 2011 12:52 am 
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horrah, some sense at last! :lol:

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PostPosted: Sun Aug 28, 2011 7:13 am 
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GE Lighting have launched a new type of retrofit ceramic metal halide lamp that they call the GE ConstantColor CMH StreetWise lamp. I have seen suggestions that it is a rival for the CosmoPolis lamp, but in reality it is just GE Lighting's answer to the CDO-TT lamp. It has standard E27 and E40 lampholders and can be fitted in place of any 50-150w SON lamp without any lampholder or control gear replacement. Below is how CosmoPolis, CDO-TT and StreetWise compare:

Philips CosmoPolis:

45w - 4500 lumens
60w - 6800 lumens
90w - 10450 lumens
140w - 16500 lumens

Philips CDO-TT:

50w - 4150 lumens
70w - 7500 lumens
100w - 10700 lumens
150w - 16500 lumens

StreetWise:

50w - 5000 lumens
70w - 7640 lumens
100w - 10900 lumens
150w - 16300 lumens


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PostPosted: Sun Aug 28, 2011 10:52 am 
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That looks like a pretty good rival to the Cosmo, but if I'm correct part of the added efficiency of the Cosmo white is the better matched optic design that may not deliver the light as effectively if a retrofit?

Still nice to get those extra lumens though.


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PostPosted: Mon Aug 29, 2011 12:53 am 
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Plus Cosmo lamps use their own special lamp holder - which is essentially the same as a GU10 mains halogen lamp holder but on a little stick! And the Streetwise lamp only fits in screwcap lamp holders. It has a higher light output than Phillips lamps... but I can't help but think that because they're GE they may fail prematurely.

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PostPosted: Thu Apr 25, 2013 5:15 pm 
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Something brand new from Philips is the CPO-TT Xtra range of lamps. These are basically the CPO-TW range of lamps using the CDO-TT envelopes. They are designed to operate on electronic Cosmo gear but with the ability to utilise the existing lantern and ES/GES lampholder.
Plymouth intend to use these to replace 100-250w SONT lamps in Urbis Saturn fittings. A retro-fit gear tray is being designed by Philips to accommodate the new ballast into the lanterns.
Here's the 90w/140w lamps that the rep brought in today...
Attachment:
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PostPosted: Thu Apr 25, 2013 7:24 pm 
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Ooh nice, those lamps would be good in a collection as they say engineering sample on them.
Nice to know Plymouth won't all be LEDs!


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PostPosted: Fri Apr 26, 2013 12:31 am 
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Well that's interesting... I've been thinking about converting a spare lantern to CPO for a while, probably a QSM I just have lying around, but the main thing that has put me off is trying to source the lamp holder with the metalwork that projects it further forward into the optic. If ES versions become easy to source and are a similar price to CDO then it might make a few people consider conversions.

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PostPosted: Tue Jun 24, 2014 11:21 am 
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Not only have Philips introduced the CPO-TT XTra range of lamps which have the ES/GES caps and envelopes of SON lamps, but there appear to have been improvements to the light output and lifespan of the existing CosmoPolis range. Below is some light output information, which is duplicated in the lamp efficiency thread:

CPO-TW:

60W: 7020Lm (117Lm/W)
90W: 10560Lm (115Lm/W)
140W: 16100Lm (115Lm/W)

CPO-TW Xtra:

45W: 4950Lm (110Lm/W)
60W: 7200Lm (120Lm/W)
90W: 10800Lm (120Lm/W)
140W: 16500Lm (118Lm/W)

CPO-TT Xtra:

45W: 4650Lm (105Lm/W)
60W: 7090Lm (120Lm/W)
90W: 10140Lm (114Lm/W)
140W: 16000Lm (114Lm/W)
210W: 22000Lm (106Lm/W)
315W: 34750Lm (111Lm/W)

And for comparison...

SON-T PIA Plus:

50W: 4400Lm (81Lm/W)
70W: 6600Lm (91Lm/W)
100W: 10700Lm (106Lm/W)
150W: 17700Lm (116Lm/W)
250W: 33000Lm (127Lm/W)
400W: 55800Lm (137Lm/W)
600W: 90000Lm (148Lm/W)

SOX:

35W: 4550Lm (129Lm/W)
55W: 7800Lm (140Lm/W)
90W: 13600Lm (150Lm/W)
135W: 22600Lm (167Lm/W)
180W: 32000Lm (176Lm/W)

...

So, as you can see, CosmoPolis has undoubtedly overtaken SON in terms of efficacy for the lower wattage lamps (100W or less). The most efficient CosmoPolis solution is the type with the dedicated PGZ12 lampholder and small lamp envelope, as opposed to the 'SON-sized' type. For wattages above 150W, SON is still clearly more efficient, but we can consider it to no longer be the best solution for what in the UK would be 10m columns or shorter. This is particularly the case for the side road wattages, where SON now appears horrendously inefficient. SOX is still the most efficient light source.

It's amazing how metal halide lamp technology has developed. Who would have believed a few years ago that it could overtake SON?


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