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Lamp/light source efficiencies http://ukastle.co.uk/discussion/viewtopic.php?f=5&t=298 |
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Author: | Phosco152 [ Fri Jun 10, 2011 6:07 pm ] |
Post subject: | Lamp/light source efficiencies |
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. |
Author: | Alex [ Fri Jun 10, 2011 9:26 pm ] |
Post subject: | Re: Lamp/light source efficiencies |
Very informative! This acts a concise reference point. |
Author: | Phosco152 [ Fri Jun 10, 2011 10:36 pm ] |
Post subject: | Re: Lamp/light source efficiencies |
I've edited my original (several times!) included additional data for SOX and also generated a page on the Wiki. |
Author: | mazeteam [ Sat Jun 11, 2011 12:21 am ] |
Post subject: | Re: Lamp/light source efficiencies |
Thanks. I had been thinking about this myself, and wondering how the light sources compared. |
Author: | Stelmer [ Sat Jun 11, 2011 8:22 am ] |
Post subject: | Re: Lamp/light source efficiencies |
Very interesting post Phosco. |
Author: | Gramma6 [ Mon Jun 13, 2011 1:20 am ] |
Post subject: | Re: Lamp/light source efficiencies |
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! |
Author: | sotonsteve [ Tue Jun 24, 2014 11:13 am ] |
Post subject: | Re: Lamp/light source efficiencies |
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) |
Author: | sotonsteve [ Sat Oct 11, 2014 8:08 am ] |
Post subject: | Re: Lamp/light source efficiencies |
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. |
Author: | sotonsteve [ Fri Nov 07, 2014 9:36 pm ] |
Post subject: | Re: Lamp/light source efficiencies |
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. |
Author: | NIGHTWATCH 50 [ Tue Jan 06, 2015 10:47 am ] |
Post subject: | Re: Lamp/light source efficiencies |
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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