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PostPosted: Fri Jun 10, 2011 6:07 pm 
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Following on from discussions elsewhere in the forums, I have complied figures for the various efficiencies in terms of Lumens/W for different lamp types. The higher the Lm/W, the more efficient the light source. The data is based on web info for Philips lamps.

SOX

Based in info from Lamptech

35W SOX+: 130
35W SOX PSG: 126.3
26W SOX E: 141
36W SOX E: 163
55/90W SOX: 120
66W SOX E: 164
135W SOX: 135
180W SOX: 150

PL-L

36W: 80.5
55W: 87

CDO-TT

Metal halide which can be used as a direct replacement for SON on same gear, all come out at approx 90 Lm/W for ratings 70-250W.  

Cosmopolis      

60-140W approx 115 Lm/W, 45W is 95.

CDM-Elite

These are the metal lamps being used by the Highways Agency for retrofit Iridiums to replace SON lighting on trunk roads.

210W: 110
315W: 114

CDM-Master

The more "traditional" CDM lamp.

35W: 94
70W: 94
150W: 86


SON Master PIA

70W: 94
100W: 107
150W: 116
250W: 133
400W: 141
600W: 150

BGP322/3 LED lanterns

The data on Philips web page is somewhat contradictory for Lumen figures and circuit wattage, possibly since the lantern is new and some of the figures may be provisional and subject to revision. However for the 4200 Lm version the efficiency for the entire lantern comes out at 59.1 Lm/W.

For the lanterns used on the A5 its 84 Lm/w. Even then the circuit power of 199W doesn't tie up with the Philips contact value - he stated 192W.

So there you have it. With the exception of the 400/600W SON, SOX is still the most efficient discharge light source.

CDM-Elite/Cosmopolis are comparable in efficiency to the medium SON lamps, CDO-TT and CDM are the less efficient types of MH lamp.

This of course doesn't give the full story. SOX gear is more lossy than SON. 35W SOX circuit loss is very similar to 50W SON. 135W SOX circuit loss is similar to 150W SON.

PL lanterns have very efficient gear and by running the lamp at high frequency (more light at high frequency operation) the lamp can be under run so that total circuit loss is often only a few watts more than lamp rating.

The power saving comes from white light in theory allowing a lower level of lumens to be used due to perceived brightness. However in many cases "lumens are king" - white light lumens match orange/yellow lumen figures, which results in over lighting.


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PostPosted: Fri Jun 10, 2011 9:26 pm 
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Very informative! This acts a concise reference point.


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PostPosted: Fri Jun 10, 2011 10:36 pm 
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I've edited my original (several times!) included additional data for SOX and also generated a page on the Wiki.


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PostPosted: Sat Jun 11, 2011 12:21 am 
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Thanks. I had been thinking about this myself, and wondering how the light sources compared.

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PostPosted: Sat Jun 11, 2011 8:22 am 
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Very interesting post Phosco.


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PostPosted: Mon Jun 13, 2011 1:20 am 
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Interesting to think that although SOX is seen as a 'poor' source of light by most people it actually gives you the best lumens per watt of any light source (apart from high-wattage SON). What is said about white light being perceived as brighter by the human eye is very true as 35w SOX  seems quite dim and feeble compared to 36w PL-L and yet you're actually getting a lot more lumens for your money. Councils need to look beyond dry figures on paper and literally use their eyes!  ;)


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PostPosted: Tue Jun 24, 2014 11:13 am 
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Just to provide some up to date information, focused around comparing Philips CosmoPolis with Philips Master SON-T PIA Plus and Philips SOX.

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)


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PostPosted: Sat Oct 11, 2014 8:08 am 
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Just to throw LED into the mix, and using the latest info for the Philips Luma range to provide figures:

90W LED (Mini Luma): 11100Lm (123Lm/W)
180W LED (Luma 1): 22150Lm (123Lm/W)
270W LED (Luma 2): 32950Lm (122Lm/W)
446W LED (Luma 3): 54400Lm (122Lm/W)

It should be noted that these are "system efficacies" rather than "lamp efficacies", so whilst for my discharge lamp figures the efficacies are higher than in reality, the figures here for LED are "true".

So as you can see, LED has achieved a very good level of efficiency, and that is before you consider that LED is white light and more directional. And therein lies the issue for the dumb. The fact that the light is whiter and more directional means the total number of lumens and power consumption of an installation can be reduced without perceivably reducing lighting performance. Maintaining the same number of lumens does not necessarily yield power savings over SON, but would make lighting appear much brighter. Installing LED alone doesn't save energy unless lumen output is adjusted to factor for improved technology.


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PostPosted: Fri Nov 07, 2014 9:36 pm 
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Having noted the efficiencies of LED lighting above, using the Luma as an example, it is worth noting that LED lighting is more complex than this information suggests. LEDs can be driven at different currents; the higher the current the brighter and higher wattage the LED. Hence, with products such as the Luma, it is possible to purchase a 200LED Luma 3 but in essence not operate them at full power and full current. The suggestion is that operating a more powerful lantern at lower current can be slightly more energy efficient and also improve the lifespan of the LEDs. Alongside the Luma range is the Luma Lite range, which in essence only operates the LEDs at full power and does not enable dimming through reduced current.


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PostPosted: Tue Jan 06, 2015 10:47 am 
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I always calculate gear losses in with this, i.e. we all think the 18watt SOX lamp is 100 lumens per watt, (1800 lumens @ 18watts), however, the total circuit watts fot this lamp are 25, (Philips control gear schedules 1991),  giving the 18watt SOX lamp only 72 lm/W, (1800 lumens @ 25watts), for actual circuit watts for HID, this list should give a general layout.

MBF mercury lamps.
50W=57W
80W=90W
125W=137W
250W=271W
400W=423W
700W=740W
1000W=1041W

SOX lamps.
18W=25W
26W=31W
35W=47W
36W=46W
55W=63W
66W=76W
90W=101W
91W=108W
135W=155W
131W=150W
180W=220W

SON lamps.
50W=62W
70W=81W
100W=114W
120W=142W
150W=170W
250W=276W
310W=340W
400W=423W
600W=640W
1000W=1020W
Philips 220W=235W
Philips 350W=372W

White SON lamps.
35W=42W
50W=65W
100W=117W

Halide Lamps.
70W=86W
150W=167W
250W=286W
400W=403W
1000W=1020W
2000W=2097W
1800W=1875W (Arenavision)

Blended lamps are listed as per wattage, i.e 160W=160W

All data from Philips 1994 and GEC 1986 catalogues.


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