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Tested: 22 Dec. 2010 - 24 Jan. 2011. I got this lamp on loan...
An asymmetric version of the E3 was already announced sometime in 2007. At that time the website said their new lamp would be approved at date XXX. When date XXX passed (whatever XXX was at the time), some time later the website was changed and a new date was put on the website. This went on until at least end of 2008. I know this because I checked their website repeatedly for availabity and/or StVZO approval of the lamp with asymmetric beam. Others have been less than amused by this behaviour as you can read for example in this posting: Foolernova (candlepowerforums) where 'chronically and falsely implying that some product of theirs had reached some SVTO/L approved status, or was ready to ship "next week"' refers to what I just described and their claims of stuff being ready when it isn't ready.
Late 2008 I contacted Supernova saying I wanted a few (well 3 actually) asymmetric lamps, whether StVZO compliant or not, for testing and to use on custom made bicycles. As I wrote on the main page, I was repeatedly promised the lamps would be made 'next week' but nothing ever happened. They never contacted me later either so 8 months later in mid 2009 I decided I wasn't interested any more and that I would not do business with Supernova ever again. I did notice Supernova lamps were put on some versions of Cannondale bikes around that time, so I suppose they gave Cannondale all of their production, but if that's the case they should have said that, not tell me fairy tales about 'next week'.
In retrospect it was perhaps good I didn't get my hands on those early asymmetric lamps as the beam pattern was very uneven which one cyclist on a usenet group named the 'batsignal' (see below for a picture).
It wasn't just that they didn't keep promises, it's the whole attitude of them which is shown clearly by what one guy (probably the same guy who promised me the lamps would be made 'next week') writes on the IBC forum (mtb-news.de). More on that can be found below.
This is the reason why I didn't even try to get my hands on any Supernova lamp, in fact I didn't even want to review any. But I got a bit less strict about the last rule several months ago and wrote on my main bicycle lighting page that I would be willing to do a review, but only if I got one on loan. In December I was offered a loan of an E3 triple and E3 pro-StVZO and here we are :)
Here's what I wrote on the main page, which was updated a bit over the last 2 years but the gist is as it was at the start of my lighting page in 2008:
Supernova E3 asymmetrical: The symmetrical beam version has been available for a few years (2007?) and at the time I was interested in them (2008) used the Seoul P4. The version with beam with cutoff at that time used a Cree XR-E Q5 and both versions were less bright than the Edelux, both in StVZO measurements (lux at 10 m in given position) and total light output (lumen). The beam pattern of the asymmetric version was pretty poor at that time, giving lots of artefacts resulting in what one person called 'the batsignal'.
Here the late-2008 versions of the Edelux and E3 are compared in beam pattern, and wall shot (from Aktiv Radfahren, issue 11/12 2008). Which one is the batsignal should be obvious :)
Note that Supernova upgrades the lamps with new LEDs regularly so currently (fall 2010) they use the Cree XP-E R3 and XP-G R5 (both in cool white). The asymmetric lens appears to be much better than in 2008-2009 judging from the beamshots on Supernova's website.
[ background from 2008-2009: As of mid 2009 I still hadn't received the lamps I wanted despite repeated assurances that "they will be made next week". In mid 2009, 8 months after requesting to buy a few E3 (asymmetric) lamps in October 2008, I had enough... I therefore have no intention of testing this lamp nor any others from this manufacturer. (well, perhaps if someone lends me one, but I'm definitely not going to buy one). Update December 2010: Well, I'm going to test Supernova products after all as I've got a E3-pro-StVZO on loan and should get an E3-triple on loan too. ].
See for a bit more on how they behave and my response on mtb-news.de at the end of this page.
Mass: ca. 155 g with bar mount and cables to dynamo and to the rear lamp.
First impressions: Superb looking w.r.t. quality of construction and the presentation.
I was very curious to see how it performed so in the evening I immediately went out testing. The button is fairly heavy going and in the cold it's not that easy to feel if you switched it or not. This is similar to the situation with the Philips Saferide LED dynamo, and the Edelux is definitely the best dynamo lamp in this respect with its sliding switch that you simply know (feel) the position of.
The beam pattern is as I first read in the review of the Airstream on bikeradar.com, i.e. it has some artefacts in it and the beam is not completely homogeneous, although they're not as bad as the bikeradar review makes it appear (but perhaps the artefacts become more apparent with the Airstream as the LED is likely driven at higher current in that lamp). At first this nonhomogeneity was inconspicuous in Supernova's own beamshots, but after reading that bikeradar review (which has a useless beamshot btw.) I checked the beamshot images from Supernova in more detail and indeed noticed what they talked about there. The artefacts and nonhomogeneity are hidden by the road and objects on it in Supernova's pictures. If you look closely at the pictures you will see: the beam is bright close to you, then on the left and right it's a bit darker and in the middle it's brighter again. I think you could envision the beam as 2 (flat) cones of light superimposed, the first a broad one, the second a hotspot. So it's actually a bit similar to the Magicshine MJ808 but of course without its huge amount of light going above the horizon.
Beamshots from Supernova's website of the E3-pro-StVZO (XP-E R3) and Airstream (XPG-R5), both with the same Terraflux lens:
The bar mount is not great, well, actually it sucks, as the lamp will rotate a little around the handlebar when encountering bumps (my first testride was with sections of roads covered with lumpy compressed snow). For symmetric beams a precise adjustment is not necessary as my experiences with the Magicshine, Ktronik Triple XP-G and Lupine Betty showed. For an asymmetric beam where you want the cutoff precisely placed so you get a good throw and good illumination of the road surface, precise angle is critical. Therefore I would get a mount that can be fastened with bolts, not rubber bands.
The standlight is very weak, and because there's very little light close to the front wheel (the beam starts a metre or 2 from the front wheel) this all means the standlight is as useless as that of the Edelux to put your bike away in an unlit shed.
The beam pattern is fairly good. There are some slight artefacts as I mentioned earlier, but they are not bad and not annoying/attention grabbing. The beam starts out fairly narrow (about 2 metre from the front wheel), and gets wider quickly to about the same width or a little wider than the Philips SLD. This is a feature of the beam in general, i.e. the beam diverges significantly at long distances which is of no use for riding on paved roads as it will light up far too much beside the road; this a pity as it just means wasted light (perhaps it is of use on winding/meandering roads, I will compare a bit more on such roads soon). This diverging beam of the Terraflux lens means brightness at long distances will never be very good so throw is almost certainly not going to rival the Philips LED bike light in the battery powered Airstream (which should power the LED at at least 1A, which it doesn't seem to do in the E3-pro). So, the beam pattern and throw are no match at all for a Philips LED bike light. The diverging beam pattern might be more useful for MTB riding, but there you don't want a beam with such a strict cutoff. Also, for MTB riding the beam is too narrow at the start. Perhaps for riding fast on not very straight roads (or better: meandering roads) is an application for such a diverging beam, however, as the beam strength is nowhere near that of the Philips LBL I just don't see the point. Perhaps with a 600 lumen lamp riding on meandering roads this beam pattern would be useful.
As I suspected, the comment by someone from Supernova that the Philips' light beam is "not bad at all, almost as good as that of the Airstream" can only be interpreted as taking the piss of the readers of the IBC forum (mtb-news.de). The beam is not as good as that of the Philips LBL (w.r.t. homogeneity and useful illumination of mostly straight roads) and throw is far less as well (in the dynamo version at least, but due to the diverging beam this is likely true for the Airstream as well). Illumination of the road surface is less even and at least in the dynamo version (the E3-pro-StVZO and the Airstream use the same lens) nowhere near as bright. There is no way in hell that the Supernova E3-pro-StVZO reaches 305 lumen. All of the above more or less confirms what I estimated about the Airstream, as I originally wrote on my page with the review of the Philips LED bike light but now in that separate wegpage. See also further on this page.
This setup is a bit messy and I will make a neat version soon, but the important thing is that it works. I've included an over-voltage protection device that comes with Shimano dynamo hubs, that I can switch on or off with the rightmost switch. The other switches switch on or off the 2 lamps to be tested, in these pictures it's the Philips SLD and the Supernova E3-pro-StVZO.
Results of switching between lamps (including having both on at the same time) gave a lot of information on the strengths and weaknesses of both beams. The weakness in the Philips lamp is too much light next to the front wheel. This diminishes your night vision (Btw., you can fix this by putting some 3M scotchlite tearable tape which is a little opaque, on the bottom left/right sections of the lens). Still, illumination of the road far ahead is very good. Weakness of the E3-pro-StVZO: beam flares out too much, and it's a bit weaker. I really noticed this by doing the following test:
I rode up to about 33 to 36 km/h several times to see if the E3-pro-StVZO would get a lot brighter but it didn't appear so. However, it was very windy and not fun riding fast even on a road where most of the snow was removed by a snow plough, and because of the road conditions (snow, ice, wet in various places) I had to pay a lot of attention to riding safely instead of the light beam, so I will try this again another night and look more closely at how the brightness changes with speed. It certainly didn't seem anywhere near the 305 lumen region as it would need to have an output higher than the Philips LBL then.
For background information on making beamshots see: Camera settings, lamp settings and roads used to make the beamshots.
Note: it was freezing, road surface was slightly wet before that so a very thin layer of ice/ice crystals formed. Because of that I made comparison pictures of a few more lamps in the beamshot session. Beamshots are not perfect, camera isn't perfectly aligned with the horizon as you can see, but hey, it was very cold and very windy :)
|0.75m E3 pro StVZO aimed fairly close
||0.75m E3 pro StVZO aimed for maximum throw
|0.75m Philips SLD (manuf. date 4010)
||0.75m Philips SLD (manuf. date 4610)
|0.75m E3 triple (summer 2009, advertised as 550 lumen), symmetric beam
||0.75m Fe Rei bike lamp with XP-G R5, symmetric beam
I set the camera to make 8 Mp pictures instead of 14Mp. The latter gives huge pictures but not much extra information as large pictures are somewhat blurry at the pixel level with my camera (as with almost all compact cameras).
The pictures don't show what I experience particularly well. It's clear that the E3-pro-StVZO has a slightly wider illumination than the Philips SLD. The throw is less than the Philips and I'd say and brightness too, but this doesn't come across well at all (you have to look closely to see this: don't get distracted by the brightness at the start of the beam). Simply judging from the pictures you may well think the E3-pro-StVZO is much brighter than the Philips SLD, and in reality it isn't... I will investigate further if light colour is an issue or if it's 'only' apparent due to the better near field illumination (from ca. 5m to 15m) of the E3-pro-StVZO combined with the icy road.
All pictures are quite dark compared to a dry/ice free road: compare the Philips pictures with earlier ones I made on a dry road 2 and you will see how much dimmer and how much reduced the throw is... So, I will probably remake the beamshots soon (hopefully there will be a few dry warmer days soon).
What is obvious is that there's no way the E3-pro-StVZO comes anywhere near 305 lumen, which was of course already clear from all the analysis earlier and my experiences. What further doesn't come across is the diverging beam pattern of the E3-pro-StVZO. The beam is just too weak to get properly captured by the camera more to the left/right of the road and beyond 25 m in particular. I may experiment with longer exposure times to better show the beam pattern while for the regular beamshots it will stay as described on the camera page.
The E3 triple from 2009 is very very dim and there is no way it produces 550 lumen. But this was clear beforehand, just as with the inflated lumen claim of the E3-pro-StVZO.
Note: The biggest problem with these beamshots (besides that all of them are very dark compared to on a dry road) is that the E3-pro-StVZO appears at first glance much better than the Philips SLD lamp which in reality I don't experience while cycling. Perhaps the reason was to do with how I angled the lamp, which is a bit tricky esp. as the E3-pro-StVZO has not that strong an illumination of larger distances which you more or less see by how little the lamp's beam changed when I set it a bit higher for more throw. Perhaps this was still too low... Note that I set up the lamps while I'm standing still which is a different situation from sitting on the bike where you'd immediately spot an incorrect lamp angle. But the good news is that I made new beamshots on road 3 (reddish asphalt) using the standard 4 seconds exposure time but also 8 seconds which show the beam shape of all the lamps pretty wel even though the road was wet, it started with very fine rain and became heavier while making the beamshots. I will upload these beamshots later today (13 Jan.)
Note: the road was wet, it was drizzling a little, later it rained harder. Beamshots made at 4s and at 8s exposure. The 8s duration was used because the road was wet which should give a dimmer view compared to my regular beamshots on dry roads, but also to better show the actual beam shape (for example, in my beamshot of the Cyo RT on a dry road 2, the beam shape is not at all clear and would need longer exposure). In future I will probably make beamshots at 4s and 8s for all beamshots.
|0.75m E3 pro StVZO, 4s
||0.75m E3 pro StVZO, 8s
|0.75m Philips SLD (production date 4610), 4s
||0.75m Philips SLD (production date 4610), 8s
|0.75m E3 triple (summer 2009, advertised as 550 lumen), symmetric beam, aimed close, 4s
||0.75m E3 triple (summer 2009, advertised as 550 lumen), symmetric beam, aimed close, 8s
|0.75m E3 triple (summer 2009, advertised as 550 lumen), symmetric beam, aimed far, 4s
||0.75m E3 triple (summer 2009, advertised as 550 lumen), symmetric beam, aimed far, 8s
|0.75m B&M Lumotec oval senso plus (halogen), 4s
||0.75m B&M Lumotec oval senso plus (halogen), 8s
My thoughts on why the E3-pro-StVZO looked a lot better than the Philips SLD in the first set of pictures are as follows (edited from emails I sent about this subject, then expanded a bit):
1 I may have just aimed the E3-pro-StVZO too close the first time.
2 The close range in the picture is a bigger part of the picture than that what's further, due to perspective. So if a lamp brightly lights up an area close to the camera, a large area will be bright, and it will appear brighter than another lamp that doesn't light up that close range as much. This is the case with the E3-pro-StVZO vs. the Philips SLD. Note further that you need the light most of all at larger distances! To combat this problem a good way to compare beams is to compare them from the top, i.e. by first looking at the top sections: Use you hand or a piece of paper to cover up the bottom section on both pictures you want to compare, then lower that to check out the lower sections. This will give a much better idea of how good a lamp is at lighting up a specific range [ note that this requires beamshots in which all settings are fairly close (angle at which the camera is pointed to the road for example) ].
3 After examining the beamshots and comparing with the beamshots on road 3, some things become clear:
3.1 It seems as if point 1 could be correct, because when you set the E3-pro-StVZO for good throw, you automatically set it lower than you would a Edelux or Philips as it just doesn't seem to put out enough light for good illumination at 45-50 m. This again means it looks better at short distances, and with the ice, it's very hard to properly illuminate anything so the difference there at long distances, i.e. ca. 25 m to 50 m, is just not something that jumps out (because it's not bright! A large bright spot in a picture jumps out at you, a not so bright spot doesn't jump out compared to a even less bright spot. I mentioned this phenomenon some time ago already in my comparison of the E3-pro-StVZO and Philips with the switchbox while riding (see what I wrote in that section).
3.2 The bigger throw of the Philips SLD, which is not obvious in the icy-road 2 beamshots is quite clear in the beamshots of road 3 (in the 4s exposure shots you can already see this). The E3-pro-StVZO beam just doesn't light up the road very well at long distances. This means more light is close to the rider (distance ca. 5 m - 25 m) whereas for fast riding, I prefer more light at 25 m - 45 m.
There are 2 possibly related reasons for the low brightness at long distance with the E3-pro-StVZO:
i. The beam of the E3-pro-StVZO diverges quite a bit.
ii. The intensity of the beam is probably already lower at 10 m (StVZO measuring distance) at the top of the beam. This would also result in a lower StVZO lux rating (if this were not the case Supernova would not talk of "The fairy tale of the lux" on their website but would advertise with "see what high lux rating we got" !), where with the lux rating is meant the highest light density of the beam at 10 m per the StVZO measurement system. A high lux rating, if that lux rating is maintained for a bit below the line on which that maximum is reached, means a lot of light will be put at long distance, if you aim the lamp far. A low lux rating will never result in long throw because not enough light is put in the top of the beam. The beam of the E3-pro-StVZO shows this, it is pretty weak at longer distances.
I'm not sure if the diverging beam is all that useful, but I still need to experiment on some meandering roads to see how well it works (possibly this weekend).
Preliminary conclusion: The brightness difference on that icy road at long distances didn't jump out, although as I said in my earlier comments from a few days ago, you could make out the Philips did a little better at long distances. Well, the current photos on road 3 seem to confirm all that. Note that in the photos on road 3 the E3-pro-StVZO looks better close to you, which it is, but just about everywhere else the Philips is brighter.
I'm going to experiment a bit more with the E3-pro-StVZO and make beamshots with the lamp at various angles...
Using the same type of setup as shown earlier, but now with those 3 lamps, in the night of 14-15 Jan. I rode a long time switching between all of them comparing light output and beam pattern. Results:
Here's an example video (mp4) that may or may not show the differences well depending on your PC monitor's pixel depth (or perhaps it depends on the playing program, for unix like OS'es: For me using an old Syncmaster 710v monitor mplayer gave a good view, xine didn't. With smplayer it's easy to adjust contrast/brightness and which gives a nice overview of how these lamps compare in beam/brightness and thus about the strengths and weaknesses of them all):
The latest E3 pro with asymmetric lens, non StVZO with XP-G LED (the supposed 370 lumen version, not listed on their pricelist but it is available from their webshop) was measured at just 140 lumen at 20 km/h (see http://www.enhydralutris.de: E3 pro (in German)), which is no better than the old version with a Cree XR-E Q5 from 2008. Assuming the electronics have changed so more power is extracted at high speed, I still think it will never get above say 240 lm maximum because the XP-G R5 in real world measurements with calibrated test equipment only produces ca. 275 lumen at 1 A (you still need to deduct losses from the lens from that!). Although it could be possible they are employing a current tripler as the XP-G is rated for 1.5 A but I don't believe they do this. For more on this see my StVZO page.
Now taking into account the measurements of 'Siam' of the Airstream which is basically a battery powered E3-pro, and which seems to run the LED at 1A, I'm now going to estimate what the E3-pro produces at best from the Airstream figures. As the E3 pro is a 2.4 W lamp that doesn't seem to get brighter at high speeds, I'm guessing it's current limited to about 0.80 A. According to the Cree datasheets, an XP-E produces 234 lm at 0.80 A instead of 273 lm at 1.00 A. So, my estimate is: 175 lm (Airstream) x (234 / 272) = 150 lm. The XP-G R5 version of the Airstream produces 217 lm, so I estimate the dynamo version produces 217 lm x (291 (=XP-G R5 at 0.80 A) / 348 (=XP-G R5 at 1.00 A)) = 181 lm. The latter is not far off from the 140 lumen that Olaf Schultz measured at 20 km/h. When looking at the chart of StVZO lamps with the amount of light in relation to speed in http://www.nabendynamo.de/service/pdf/Illuminaten-Lumen2009.pdf, we can then perhaps expect an increase of 10-15 lumen at 30 km/h compared to 20 (note that assuming this, means assuming that the driver is not strictly current-limited, or if it is, then it is current-limited to slightly above what one gets at StVZO's test speed of 15 km/h), so that means one could expect 150-155 lm for the XP-G based E3-pro, even less than my Airstream based estimate. All estimates are less than half what Supernova claims...
I was told the following about opening the Supernova E3 (an older version, ca. 2009) by someone who's been analysing various LED bike lamps (I'm paraphrasing btw.):
Supernova tell you the LED is upgradeable, but they also say the warranty is void if you try to do it yourself. The housing contains a strong spring keeping the lens in place, and when you open the housing, one (or more) of the feet of the lens will snap off due to this. So you can't actually open up the housing yourself, never mind upgrade the LED to higher binning...
Make of this what you want: is it deliberate (to make you go back to the manufacturer and have them upgrade the lamp) or a design flaw? In any event you should be very careful if you have one and want to open it up.
Supernova of course isn't the only one making lamps that are hard to open: The Edelux and Philips SLD are the same, or rather, there the problem is that you don't know how to open them (without damaging them). With the E3 pro it's easier but then (at least with that ca. 2009 version) you get hit with this problem...
Note: The E3-pro-StVZO also appears to be hard to open, this wasn't the case in the earlier non-StVZO version (as per the above conversation), so the cap may be glued on. This may be due to the StVZO rule that in lamps not using standardized light sources (only incandescent bulbs are standardized), the light source (i.e. LED in this case) must be fixed in the lamp. So, if the LED is easily removable then the housing must be glued I suppose. Note that in the Philips LBL, the housing is easy to open but the LEDs are glued to the housing...
Observations (or neutral points):
The 3 best dynamo lamps at the end of 2010 were the Schmidt Edelux, Philips Saferide LED dynamo, and Supernova E3 pro with asymmetrical lens (2010 version), are similar in overall performance. All have their strengths and weaknesses (the main weakness of the E3 is the weak illumination at large distance, the Philips has too much light near the front wheel, the Edelux has the smallest area that is illuminated), so which one is the right one for you depends, besides the beam pattern, mainly on price, design/looks, and the on/off switch. At the end of 2011/early 2012 this changed with the availability of fairly cheap headlamps with good beamshape similar to that of the E3-pro-StVZO: The Herrmans H-diver and Philips Saferide 40. So at this time if you chose the E3-pro-StVZO, you will pay mainly for the housing... (but this is true now too for the Edelux which is no longer the best headlamp regarding light beam since the Philips Saferide 60.
For me the conclusion is: Nice lamp, too bad it's made by Supernova ;-)
Because I had enough of what some guy from supernova was saying about lamps from other manufacturers on the IBC forum (http://www.mtb-news.de/, see for example this thread: IBC forum: Supernova Airstream), in a derogatory manner without anything to back up those comments and his comments about the Philips LBL in particular were just bullshit, but also because of how he reacted about the necessity of measuring light output, I lambasted Supernova and that guy on that forum (in the thread about the Airstream, IBC forum: Supernova Airstream, see page 4 and 5).
This was just after a test in Tour of which he told the results in a posting. I have to say this test is pretty poor and biased towards Busch & Müller and Supernova: Tour magazine: 2011-1 Lighting test analysed.
When confronted by true lumen output of lamps and that the Supernova values can't be real, he said that they test with their suppliers (if that's LED output, then I don't believe that for a second) and that tests should be done by a neutral party giving an official certificate. That just takes the biscuit and shows how they act. You may have to deliberate a bit to realise what he really means with that, which is this: By saying this he invalidates any measurements already done (of their products or those from other companies), i.e. that's an excuse not to do measurements themselves, and for not accepting anyone else's measurements. This was the trigger that made me, finally, respond to what that guy had been spouting there.
I was already tempted to give harsh criticism because of the nonsensical comments about the Philips LBL he made a few weeks earlier (that its beam was 'not bad at all, almost as good as the airstream' etc., see the review of the E3-pro-StVZO and of the Philips LBL for more on that) but I only did so after that response from him about light measurement.
So, I gave a calculation that shows the output Supernova claims of the Airstream is impossible with the battery they use/run time given, and also that it appears besides just using datasheet values for LEDs, Supernova doesn't even deduct the optical and electrical losses one can expect to get at an estimate of the light output. I also criticized the beamshots in Tour (German magazine, see also Tour magazine: 2011-1 Lighting test analysed) and I think that that magazine's lighting review is bought for (in the sense of: "you give us a good review, then we will advertise more with you"). I concluded with a challenge, to send 'Siam' & Olaf Schultz an XP-G based Airstream for lumen measurements, and to send me one for a test in the same manner as I do all my tests. I also said I don't believe Supernova will take up this challenge because they are not interested in facts. Perhaps that would make them feel even less compelled to take it up, but I don't care, someone had to tell them the way it is...
Supernova was now in a difficult position, either not accept my challenge, or accept it and be confronted with critical reviews. They were checkmate but didn't realise it yet. If they did nothing they would have got questions "why not", if they did, then, well, that's pretty clear:
After this challenge from end 2010 on the IBC forum, Supernova didn't send me an Airstream to review; 'Gregor' gave some bogus "we don't send lamps to individuals" but really, they were simply afraid they would get hammered in a direct and proper comparison with the Philips LBL (unlike what 'Tour' did!), and of course that was indeed what was going to happen because it's clearly inferior in light output.
But they did send an Airstream XP-G and XP-E (StVZO) to 'Siam' to measure the output in lumen, and so partially accepted the challenge, which was also a checkmate.
2011-2-14: My estimates about the maximum output of the Supernova Airstream have been confirmed by 'Siam'. My estimate for the XP-G version was: at most 240 lm, well the results are: http://www.mtb-news.de/forum/showpost.php?p=8019707&postcount=1145: 217 lm for the XP-G version, and 175 lm for the StVZO version. This is lot less than the Philips LBL (270-291 lm) which also doesn't have a diverging beam, which confirms that my estimate that useful illumination of the road surface and throw by the Supernova Airstream would never get close to the Philips LBL, was also correct. I was of course already pretty sure of this after my tests of the E3-pro-StVZO, but it's nice to get objective confirmation by virtue of measurement of the light output of the Airstream.
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Last modified: Thu Dec 27 12:54:25 CET 2012