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GEC SOX 90W

GEC SOX 90W

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GEC lamp, luminary, ballast, everything

Lucas.jpg lantern_011.jpg SOX90_on.jpg short_uv.jpg

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Manufacturer:GEC

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Album name:tuopeek / Luminaries
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Date added:Mar 04, 2012
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Dave the lighting guy
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Mar 04, 2012 at 03:34 PM Author: Dave the lighting guy
your lantern is the GEC Z9464, for integral gear. i have a GEC Z9454, for remote gear. check out my album. you'll see it there. any info on these old english lanterns, dont hesitate to ask me.
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Mar 04, 2012 at 03:43 PM Author: tuopeek
Must admit to a slight cheat here. It originally was a Z9454 but I found the bits to make it a Z9464 as I liked the internal gear version. The only difference was it is painted white inside even the holes were tapped in the aluminium casting.
Dave the lighting guy
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Mar 04, 2012 at 03:52 PM Author: Dave the lighting guy
they were are all versions. the GEC found it easier to produce one casting for both lantern versions
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Mar 04, 2012 at 04:29 PM Author: Skiller
Niiiicee! I really like these lanterns.
I'll never see one in person though, nearly no SOX and especially no GEC lanterns in Germany.
Dave the lighting guy
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Mar 04, 2012 at 04:36 PM Author: Dave the lighting guy
unlucky! here SOX is still by far the most common lamp to be seen, however MH, SON, LED and all the other crap is taking over. personally, if the councils want to save money, INSTALL SOX!!!! the most efficient lamp source ever! (apart from LED, but they fail too much... and you know what their light spread isn't the best)
btw isnt germany's lighting still made up of mostly fluorescent and mercury???
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Mar 04, 2012 at 04:48 PM Author: tuopeek
@Skiller, thanks, this was a very common lantern in the UK there are still quite a number in service.
@Dave the lighting guy, I believe sodium lamp efficiency still has the lead on LED. It just the fact that the spread angle is smaller so it reduces reflector losses that makes the appear better.
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Mar 04, 2012 at 04:51 PM Author: Ash
The light source is efficient, but light fixtures like this one are among the least efficient ones - what the lamp gives is wasted to the sky from the fixture

But it amazes why they dont simply make new SOX fixtures with better design. Its like they blame the lamp technology for the low efficiency of the old fixtures

Nevermind that some of the HPS stuff installed (cobra heads...) is not much better
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Mar 04, 2012 at 05:11 PM Author: Skiller
@ Dave the lighting guy
Yes, there is still fluorescent and mercury to a great extend (but probably not "mostly" anymore). It depends on the area, here in my area (Frankfurt) there's still quite some MV but there never was that much fluorescent here and so there is even less fluorescent now. There's tons of fluorescent in southern Germany and around Cologne (most are 30-55 years old). Here, HPS is taking over. I don't like HPS in side roads where there was MV before, it is a big downgrade if you ask me.

I really like fluorescent and especially MV and we have some really awesome lanterns for these over here, I think of them as some sort of consolation for having almost no SOX in street lighting. It's just sad however that SOX is such a rare sight here.
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Mar 05, 2012 at 12:49 AM Author: Al_M
That's a nice pic, I have a Z9464 that I received recently from the UK. Australia and New Zealand used to have loads of them but they are a very rare sight here now (all SOX lanterns are). Only consolation is that we still have a lot of MV.

Traffic signals & street lighting engineer. Please bring SOX/LPS back Downunder!!

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Mar 05, 2012 at 01:41 AM Author: dor123
Those GEC and Thorn Beta SOX lanterns, considered as "Non cutoff" lanterns, similar to the bucket and powerbrakets lanterns in the US, and unlike most lanterns that aren't postop, but mouted on an arm.
Several have no reflector at all, and several have arced reflectors.
In several GEC and Thron Beta SOX lanterns, the LPS lamp lies on the bottom part of the lantern: "Good" conditions for light pollution.

I"m don't speak English well, and rely on online translating to write in this site.
Please forgive me if my choice of my words looks like offensive, while that isn't my intention.

I only working with the European date format (dd.mm.yyyy).

I lives in Israel, which is a 230-240V, 50hz country.

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Mar 05, 2012 at 03:39 AM Author: Dave the lighting guy
if ever you recieve a gearless GEC Z9454, you'll notice how light the thing is, and also how darn low the lamp is in the bowl... itsright at the bottom. if these SOX lanterns were designed better, maybe then the light control/spread would be better. take the Thorn Alpha 9 for example, the deep bowl ones with gear, the bowls on these are humongous. the lamp lies quite low in the fitting, yet Thorn still made the effort to try and centralise the lamp in the shade, so the lantern looks like one big square when viewed on its side. light pollution gallore here.
@ash, i've always said, and i always will say, SOX really is the best light source around. shame its fell out of favour now
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Mar 05, 2012 at 03:47 AM Author: dor123
Ash said in the past, that bluer light is better for streetlighting than orange light, because with bluer light (Such as MV), it is possible to have a better visibility, with much less light than with an orange light (Such as HPS and LPS), because this allow the night vision to become active, and so the light pollution is avoided.
To get better visibility with HPS and LPS, very high lighting level is required, which is why these lamps causes light pollution. LPS require even high power to get a better visibility, as its spectrum is monochromatic, and the wavelength of the sodium D lines, is virtually out of the curve of the night vision. So in the case of extreme night-vision activity that caused by an environment of extremely low lighting levels, mercury lamps actually will be more efficient than a LPS (SOX) lamps.
In the site of James Hooker, there is an information about this: http://www.lamptech.co.uk/Documents/SO2%20Spectral.htm .

I"m don't speak English well, and rely on online translating to write in this site.
Please forgive me if my choice of my words looks like offensive, while that isn't my intention.

I only working with the European date format (dd.mm.yyyy).

I lives in Israel, which is a 230-240V, 50hz country.

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Mar 05, 2012 at 03:53 AM Author: Dave the lighting guy
thats the exact reason SOX is going out of favour noow. the wavvelength apparently 'isnt good for your eyes'... thats funny. i havent suffered bad eyes from them. i prefer them more to the CMH thats now installed around here. they're absolute GLARE BOMBS... and i HATE them. to me SOX is a lot softer on the eyes.
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Mar 05, 2012 at 04:09 AM Author: dor123
Dave: The wavelength is good for the eyes, but isn't suitable for nightvision, as the eyes will hardly see with this wavelength at low lighting level, compared to a light source that have bluer wavelengths (MV).
The CMH that installed in your country, are glare bombs, not because this lightsource is such, but because they installing too high wattage CMH lamps in the new lanterns.
For roads, lanterns with 100/150W CMH and with a flat lens and a suitable beam angle, willn't be glare bombs at all (CMH are available also in elliptical diffused format) and still will have much better visibility than the SOX, especially if 4000K and not 3000K are used (I didn't heard of a 6500K CMH, other than EYE/Iwasaki in Japan).

I"m don't speak English well, and rely on online translating to write in this site.
Please forgive me if my choice of my words looks like offensive, while that isn't my intention.

I only working with the European date format (dd.mm.yyyy).

I lives in Israel, which is a 230-240V, 50hz country.

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Mar 05, 2012 at 04:25 AM Author: Dave the lighting guy
so maybe thats why. instead of 70W CMH, they're using 100W mounted at 6M... replacing 35W SOX... whats the point? the new ones are using nearly 3 times as much electricity... and then the councils looking at shutting the power off to them at midnight? poitless. maybe if they used SOX or LED maybe they wouldnt need to do this. as of now, i'm restoring a shovel floodlight and then having it mounted on the back of our house to have a bit of overnight security when teh streetlights are off.
to be honest, i doubt its because of too high a wattage at too low a mounting height, i think it may be down to the lantern optics itself. the lanterns are Holophane QSS, which A) look ugly and B) are glare bombs. they use G12 CMH. the opical system is a clear glass and smooth aluminium optics. the Philips Iridum, also using the same lamps and optical system, they're as glary as anything too. if they used an opal glass on them instead of clear, maybe they would'nt be so glary. on saying that, the council are thinking about replacing them with LED, which will be better, but the roads will be slightly darker. at least it'll (hopefully) banish these glary things.




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Mar 05, 2012 at 04:27 AM Author:
Its precisely this kind of silly talk that is is giving son and sox lamps a false bad name,the simple facts are that sox lamps are still and always have been the most efficient light source and this is simply because the human eye can see better in this colour light,people forget that to achieve similar lighting levels from any other lamps will always require a higher wattage lamp,a sox E36 for example is far better at illuminating a residential street than a 80/125w mercury lamp,the only reasons this is not a popular lamp now is because our ever nosy CCTV society doesnt like them due to not being able to see colours correctly and the one manufacturer Philips left making them are producing ever poorer quality lamps.Dont forget Sox is still one of the few lamps that contain no mercury and so can easily be disposed of or recycled.
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Mar 05, 2012 at 04:31 AM Author: Dave the lighting guy
maybe they're deliberately doing this so no one buys them, meaning SOX goes obsolete.




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Mar 05, 2012 at 04:34 AM Author:
I hate the newer cmh/cosmo lamps we have lost our 90w sox light in favour of 150w cmh which all it does is create a pool of light then a dark patch between each light,the roads look like zebra crossings at night.
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Mar 05, 2012 at 04:41 AM Author: Dave the lighting guy
i hate them too. we lost the final untouched 90W SOX stretch recently, all replaced with this AWFUL light. its exactly like you say, bright patches then dark patches, they're way too bright for the road. the 90W SOX should've stayed, of course, no one listens to you, cause they know your right and they're wrong, and they dont want to admit it. bunch of morons. the police only dislike the SOX so they can spy on us with those CCTV cameras. its like living in the big brother house here. where ever you go, your being watched.
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Mar 05, 2012 at 04:42 AM Author: Al_M
I was always under the impression that SOX was favoured in towns/cities that were prone to fog issues as the yellow light cuts through it much better than white light with the added benefit of being an efficient light source. As far as I'm aware fog hasn't stopped being an issue in most places around the world...

I'm gathering as much SOX equipment as I can get as I know without collectors like us they will go the way of the dodo.

Traffic signals & street lighting engineer. Please bring SOX/LPS back Downunder!!





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Mar 05, 2012 at 04:47 AM Author:
Well if things all went wrong in the world of energy and councils were forced to fit the most efficient all round best lamp with no other considerations it would still be sox at the top of the list especially now there is a sox E PSG version available, a sox E66 sounds a more efficient sensible lamp to use than a 150w cmh on suspect electronic control gear.
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Mar 05, 2012 at 04:49 AM Author: Dave the lighting guy
thats another upside to the SOX lamps. where fog is, you can still see the roads clearly, but with CMH or SON, your having to go painfully slow just to see where the hell the roads are. i love fog anyhow. it allows you to see the main beam from the streetlights.
thats why i love collecting lamps/fixtures, cause in a few years time, they would just go extinct. its like we're saving them for future generations, so they can appreciate what we had, when the rest are no longer around. its a way of preserving our history in a sense... i just hope that the generations who inherit our collections, sell them to other collectors or keep them back.




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Mar 05, 2012 at 04:52 AM Author:
I just wish philips would sort out the reliability problems espesh in the 180w ones which is shocking and there is no excuse for this considering its such an old lamp.
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Mar 05, 2012 at 04:55 AM Author: Dave the lighting guy
its due to the cost of everything, they're bringing down the quality to bring down the cost of manufacture, then they charge you through the nose and ears for them, for them not to last as long, meaning you have to buy loads of them. its a sneaky way to make a profit.




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Mar 05, 2012 at 04:58 AM Author:
And the same will happen with CMH and the cosmo lamp and we will be stuck with expensive problems.
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Mar 05, 2012 at 05:01 AM Author: Dave the lighting guy
what is this world coming too? in the end no one will be buying lamps if they cant last anymore than 3 weeks due to bad quality.




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Mar 05, 2012 at 05:04 AM Author:
Until the next new thing comes along then fools rush in.
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Mar 05, 2012 at 05:25 AM Author: Dave the lighting guy
exactly!!! the new stuff is that bad, it just fails in a few months or so. they keep you so stupid, so when something new comes out and theres a messive rush for the product, it'll fail pretty early on guranteed, meaning they've fobbed you out of loads of money and then you cant even get it replaced. its another way to get money out of you, by making things to fail. thats companys for you. they've got you in the front and in the rear.
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Mar 05, 2012 at 05:34 AM Author: dor123
I have an experience with the 3eInternational Alliances at the downtown of Haifa, that several have 250W 4000K and 6500K quartz MH lamps and several have HPS lamps: The visibility is much better with MH than with the 250W HPS lamps, even if the light is reduced with the MH lamps.
I have the same experience with the Schreder Furyos in Hadar city center, that the ones in Herzl street have Osram Powerball HCI-TT 150W/830 (3000K) and the rest are HPS (Visibility was mcuh better with the MH lamps, despite light levels were less than that of the HPS lamps).

I"m don't speak English well, and rely on online translating to write in this site.
Please forgive me if my choice of my words looks like offensive, while that isn't my intention.

I only working with the European date format (dd.mm.yyyy).

I lives in Israel, which is a 230-240V, 50hz country.

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Mar 05, 2012 at 05:44 AM Author: Dave the lighting guy
i'd have a MH lamp with a similar colour output to a mercury. that i wouldnt mind.
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Mar 05, 2012 at 12:54 PM Author: Ash
Peopl indeed dont like the color of HPS and LPS. One cause is that the light "is yellow", well so what appreciate what you have

In fact, we have to look into 2 groups of lighting requirements :

- Roads and footpaths that need just barely any light to see something

- Areas where you need floodlighting like parking lots

Your vision can be either day vision (which sees best with warm colors), in which it takes significant amount of light to see well, or night vision (which sees best with blueish light), in which it see well with very little light

There is no medium point between day and night vision. You have to install light for either one or the other

A footpath lit by 125W 40Lm/W 5000Lm mercury inefficient sphere fixtures which throw light equally in all directions. The fixtures are installed on 4M poles spaced 30M apart

The darkest point on the footpath is between 2 poles, at a distance of 15.5M ( sqrt(15^2+4^2) ) from either lamp

The light is hitting the earth at an angle of 14.9 deg ( tan^-1(4/15) ) at this point

Imagine a sphere around such fixture, which area ( A = 4*Pi*R^2 ) is 1M^2, surrounding the fixture. This sphere is getting 5000Lm equally on its surface, which is 5000Lx brightness

Now imagine a sphere at the radius of 4M surounding the fixture. The area is 201M^2. 5000Lm on this surface are 24.9Lx - and thats the brightness on the footpath directly under the fixture. Thats about the brightness in a living room with partially dimmed light

Now imagine a sphere at the radius of 15.5M surounding the fixture. The area is 3019M^2. 5000Lm on this surface are 1.65Lx if we would hold a board facing the light. However the light is hitting the footpath at 14.9 deg so we get only 0.25 ( sin(14.9) ) of this = 0.41Lx. And the light is coming from 2 lamps so we get 0.82Lx. Thats about 3 times the light of full moon

On a similar calculation, the light at 10M from fixture 1 and 20M from fixture 2 is 1.27Lx from fixture 1 + 0.18Lx from fixture 2 = 1.45Lx total

With this level of lighting, you can see it well with your night vision without fatigue



The mercury are changed to 70W 120Lm/W 8400Lm HPS or very close 55W 160Lm/W 8800Lm SOX. We save 44% (HPS) or 56% (LPS) energy. not bad, is it ? and the light in plain Lx is now 1.7 the light that was there before - so 42.33Lx under the fixture, 1.4Lx in the darkest spot, 2.47Lx in 10M from the fixture

The lighting in the brightest spot is now allmost that of the light in a living room, and you see there well with your day vision. But at an entire area of 10M (centered between the poles) there are just 2.47Lx - thats about the darkest twilight. Now its not twilight in daylight color - its twilight brightness in orange glow - you can't properly switch to night vision due to the light color, and your day vision is getting tired



To get light level to double that (to see better despite the color), lets try to bring lighting levels up to 5Lx in the 10M point. Now thats 150W HPS. It allready taks more than the original mercury. It gives enough light to see in the dark spot, but is allready 2 times brighter than the lighting of the living room in the bright spot - causing a lot of light pollution



You can claim that its the fixture's fault. With a sphere fixture that spread light in all directions (and up), thats right. A better fixture would not only prevent 1/2 of the light going directly into the sky (so double the usefull light to begin with), but also reduce the light in the spot directly below it and direct more of it to the area farther on the footpath - like the 10M and midpoint locations

But then again, you could install the new fixture with mercury lamp, no need for the sodium lamp....



Floodlighting is another thing. In floodlighting you want day vision so at least some 20Lx, which is your target no matter how you reach it. Here is the right placeto use HPS and SOX as they give you more Lm/W, even than LED




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Mar 05, 2012 at 01:04 PM Author:
we simply dont need MH or CMH lighting on our streets or highways,the fad for this white light which is always of far higher wattage is stupid,what do we need white light in our streets for !,to do out night time outdoor painting,to check that our cars have not magically changed colour,this 250/400w white lighting should be kept at best for city centres and shop display lighting.
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Mar 05, 2012 at 01:24 PM Author: Ash
MH has its advantages : It is by far more efficient than mercury while still having night vision compatible light, but that comes at expense of higher maintenance costs and shorter lamp life

So if you need white light but better than mercury, go for MH

But in most places you dont need exact light level anyway so you can install either MH or mercury, even of the same power for a similar result




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Mar 05, 2012 at 01:34 PM Author:
MH is only good when new and its light drops off quite terribly through its life along with colour shift between lamps,sox does not loose light as it ages and is uniform in colour between lamps,35 and 55w sox lamps are perfectly sufficient for streets and roads certainly not 150 cmh lamps,most installers forget the point where light level is sufficient and a pool of glare.
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Mar 05, 2012 at 01:41 PM Author: Ash
For long spans, the 35W MH would be good too (if not its life length problems), and 50W mercury would be better than the SOX as it works better with night vision

For localised lighting, where the SOX can reach day vision brightness in the area it is meant to light (ie localised floodlighting application), it will be better than othe lamps due to plain Lm/W




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Mar 05, 2012 at 01:51 PM Author:
Am i some kind of alien that its just my eyes that think a 35w sox lamp is way brighter over a bigger distance than a 50w mercury lamp and i mean at ground level not looking at the lamp,the mercury lamp will also look pretty poor after 10,000 hours,we need our streets and roads lit not over lit with bright white light,there is an important efficient difference.
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Mar 05, 2012 at 02:10 PM Author: Ash
It is brighter over any distance as it has more Lm, so more Lx at the objects the light hits

Now, what you can actually see with the given Lx of the given color ? This depends on the color of the light vs your vision mode. The light might be enough to see stuff at the lowest level of day vision, but would make better results with night vision even if the actual Lx is lower




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Mar 05, 2012 at 02:13 PM Author:
Mercury does not have more LM than SOX simple as that
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Mar 05, 2012 at 02:47 PM Author: Danny
The only thing that people don't like about SOX, is the Colour. Mercury Vapour Lamps go dim after a while as the Arc tubes blacken and it it decreases the light output quite abit so they are usless although i like mercury... I have a 80W Merc lamp that has an arc tube THAT BLACK that it lets out about 25Watts.... Why cant people just make White Lamps to fit into SOX Fittings That would be MUCH easier to do than buying lanterns worth £300 EACH... Sox is the most efficient.




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Mar 05, 2012 at 02:51 PM Author:
Shame as colour is not required on motorways or most streets.
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Mar 05, 2012 at 02:52 PM Author: Danny
Yes its a big shame... Sox also cuts through fog better too... Cosmo is going to be usless in THICK fog




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Mar 05, 2012 at 02:54 PM Author:
Cosmo is useless it needs a re think i terms of light spread and lantern designs.
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Mar 05, 2012 at 02:55 PM Author: Ash
See my example above - where SOX gives 4 times more Lm than mercury for the same power

The catch is, that your vision have 2 quite distinct modes :

Day vision - which is working well with any color as long as the brightness is sufficient

Night vision - which is working well with moonlight etc, therefore mercury, but not as well with the SOX because the eye sensitivity to yellow is lower than to blue and green in night vision

The lighting installation determines what vision it will work with, depending on the light color and brightness. A system that gives enough light to work with proper day vision (few Lx and up) can be either color as appropriate (so HPS and SOX for higher efficiency). A system that gives too little light would be better white light source such as mercury, MH, fluorescent, white LEDs etc



The actual problem with SOX (where it is used in a place appropriate for it), IS the old fixtures. So i can see what is the point in changing the fixtures - even more than changing the actual lamps

There is a lamp that can fit well in SOX fixtures - a PL-L. Perhaps it could even work on the existing SOX ballast just add a starter (can anybody test that ?)


Cosmo is usefull mostly to the manufacturer, as it is proprietary design with limited compatibility to anything else

What if this standard will be discontinued in few years, or the manufacturer will drive the lamp cost up ? Will you then replace all of the cosmo fixtures to ES MH fixtures, possibly also have to replace all the gear.....
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Mar 05, 2012 at 02:55 PM Author: Danny
Couldent of said it better myself Gav... Some of the Lanterns are ugly




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Mar 05, 2012 at 02:57 PM Author:
Ash have you seen Sox installations or are you just talking bollox ?
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Mar 05, 2012 at 03:04 PM Author: Ash
I seen 1 installastion when i was kid

Most of what i am saying, is what i know from HPS. It is mostly applicable to SOX too - the 2 only differences between HPS and SOX _for the purpose of this discussion_ are efficiency (about 30% higher in SOX) and performance in fog (better with SOX)

But anything else, about the night vision, is the same
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Mar 05, 2012 at 03:06 PM Author: Kev
OK SOX Is still the most efficient light sorce and to be fair a good SOX lamps out lives the adverage LED fitting from what i have seen so far!
SOX-E on a HF ballast is almost 200 Lm/W over infact which is FAR FAR FAR more than retarded LEDS with their crap Drivers!
I have seen some full cut off SOX lanterns before with good spread. Yes Cosmo is CRAP in the Fog too as i have driven in the fog under cosmo, SOX is much better. It is easy to confuse Cosmo with on coming cars!

Voted to leave the EU and proud! 👉🏻🇪🇺🇬🇧





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Mar 05, 2012 at 03:07 PM Author:
Well i cannot see better at night with similar wattages of mercury to sox,and its rare to find similar wattages of the 2 ,mercury is usually always found in higher wattages for the same size roads/streets,why is that then?
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Mar 05, 2012 at 03:14 PM Author: Kev
OK SOOOO From what i understand here, the person who is saying SOX is not efficient has only ever seen one installation....Someone has been reading BS written on peoples websites too much i think.
SOX lamp = reliable SOX Gear = reliable and the lanterns are very robust in general.

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Mar 05, 2012 at 03:17 PM Author:
And easy to replace,fiddly process getting into an urbis fitting optics and messing about with cosmo lampholders.
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Mar 05, 2012 at 03:20 PM Author: Kev
True and they burn out as i have found. Cosmo ballast = 50000 hours MAX many early failures, sox ballast...well anyones guess. Have heard of the gear in base back board rotted out ballast swinging in the bottom of the column by its cables still working!

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Mar 05, 2012 at 03:24 PM Author:
I had the Philips rep about the cosmo ballast failure problem,he said it was mainly the 60w version and he blamed the uk voltage as they were designed mainly for the european 230v system and the uk did nit fully adopt it and we can still see voltages in excess of 240v,he says philips changed the ballast to the Extreme version,would never have had that problem on magnetic gear.
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Mar 05, 2012 at 04:06 PM Author: Skiller
That's quite a lame excuse, I mean as if they didn't know before that the UK is rather 240V than 230V.




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Mar 05, 2012 at 04:07 PM Author:
And i distrust there abilities more than ever now
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Mar 05, 2012 at 04:13 PM Author: Kev
Magnetic gear all the way for me. Removed some electronic today and swopped it for switch start. 1 conversion and 2 replacment fittings.

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Mar 05, 2012 at 04:14 PM Author: Ash
What you miss here is the other side of the story : While SOX emits allmost 4 times more Lm/W than a mercury lamp and there is no doubt about that, you can't see allmost any of the light with your night vision - so 95% of this emitted light is useless

Similar problem happens with HPS. Actually, for SOX the problem is way worse - HPS have significan part of the spectrum at shorter wavelengths which are better seen, while SOX emits at 1 line of which you can see 5%. Now that's efficient isnt it ?

Efficiency calculaion has to be done all the way from the electricity, ballast, lamp, fixture optics, color of lit surfaces, and your eyes. Stopping the calculation at the lamp and taking that for bottom line result is doing half work


I can agree about cosmo's and low quality electronic gear here, but well there are so much mercs and MH's on magnetic gear which are not less reliable than any other lamp on magnetic gear. So the gear is not even a factor here, except for the cosmos that dont have magnetic option
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Mar 05, 2012 at 04:22 PM Author: Kev
SON is my second favorite next to SOX. Actually the first Cosmos out DID have a magnetic option!

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Mar 05, 2012 at 04:24 PM Author:
My fave was the old GEC Son lamps with the solarcolour label on them,they lasted longer than anything id ever seen or seen since.
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Mar 05, 2012 at 04:28 PM Author: Kev
I have a nice double ended GEC Solarcolour 400W SON TD lamp! Dont have a fitting for it though. I have quite a few of the Thorn SON TD lamps too same size as a 1500W Halogen!

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Mar 05, 2012 at 04:35 PM Author: Ash
We had Mazda (Philips France ?) HPS lamps here in the late 80's and early 90's - some of them are still out there, taking a long while to warm up, but keep going every night




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Mar 05, 2012 at 04:37 PM Author:
i have a BLV German 250w double ended son lamp new in the box,i suspect Blv didnt make it though.
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Mar 05, 2012 at 04:43 PM Author: tuopeek
Hmmm, interesting discussions here. One point I would like to know is at what point does SOX lighting become poor due to ‘dark adaptation’ of the eye. I was told it take about 15 minutes of complete darkness for the eye to become dark adapted. Most of us go from brightly lit buildings into brightly light streets so, I guess, our eyes will seldom make use of the night vision shift.
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Mar 05, 2012 at 06:39 PM Author: kai
A single bookpage via Google ...
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Mar 06, 2012 at 02:47 AM Author: tuopeek
Thanks for the link
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Oct 27, 2014 at 03:49 AM Author: Beta 5
That is what I did with my GEC Z9530 (35W SOX), I put ballast and ignitor in it as I did not have any where to put remote gear so now it is technically a Z9532

Thorn Beta 5 35W SOX 1965 - 2008. Top entry/Side entry

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