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LEP mast lighting in Kanata, Ottawa, Ontario revisited

LEP mast lighting in Kanata, Ottawa, Ontario revisited

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Had to visit again to take pics of the roadway. I used an unmodified camera at 5300 K setting. Did almost no color tweeking. Roadway looks close to the real feel, looked slightly bluer. It's a drastic difference in color compared to the HPS and about half the brightness.

LEP-masts,now-LED.jpg IMG_8971_LEP-masts.jpg high-mast5-origpic-153430.jpg LEP-spectra.jpg

Light Information

Light Information

Manufacturer:Unknown?
Lamp
Lamp Type:Light Emitting Plasma
Electrical
Wattage:1000w assumed
Optical
Color Temperature:5700K ?

File information

File information

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Filename:IMG_8971_LEP-masts.jpg
Album name:lights*plus / LEP Lighting
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Keywords:Lanterns
File Size:1895 KB
Date added:Nov 21, 2016
Dimensions:2400 x 1600 pixels
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Lightingguy1994
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Nov 21, 2016 at 01:22 AM Author: Lightingguy1994
I've always wondered why each mast has a different number of sodium fixtures on the ring. some have just 3 others have up to like 12 units.
The LEP ones at least look sort of like mercury vapor/metal halide a little

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dor123
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Nov 21, 2016 at 02:14 AM Author: dor123
Have you measured the spectrum of these high masts? I think that LEP is simply an electrodeless MH 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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Nov 21, 2016 at 02:51 AM Author: lights*plus
That's about right. I took spectra pics last time and I put up a published spectrum. Visually with a grating, it looks much like the published spectrum but more continuous with less peaks. The fill is supposed to be proprietory but we can easily tell there's indium-halide at least.

As for the HPS masts, I believe they put more units near the off/on ramps as they're trying to light everything from the center of the highway. Some masts have just a few lamps where the exits are already lit.
dor123
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Nov 21, 2016 at 03:27 AM Author: dor123
The spectra of these LEPs that you captured, were from far distance. From close distance it would look better.

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.

Flurofan96
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160W SBMV on a summer night!


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Nov 21, 2016 at 04:36 AM Author: Flurofan96
Seem they have better brightness and colour tone than LEDS

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dor123
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Nov 21, 2016 at 07:02 AM Author: dor123
They looks bluish in this picture in contrast to the HPS high masts.

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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Nov 21, 2016 at 11:31 AM Author:
This particular model of electrodeless lamps has quite a high color temperature, even by normal MH lamp standards, simply because the main fill chemistry in the burner is indium halide which is at a high-enough vapor pressure to generate a broad-band, mostly continuous optical emission spectrum. That's because molecular species become dominant in the indium halide vapor plasma above a few hundred millibars, and indium monohalide molecules then become an important source of radiation. There's also a small dose of rare earth halide which is added, such as holmium iodide or bromide, in order to increase the red output and balance the overall light color.

The problem with such capacitively-driven electrodeless lamp technology is that the lumen efficacy of the burner is not better than that of standard MH lamp. In fact it is often lower, and in this particular example the burner efficacy lies around 75-80 lm/W because of the very significant infrared emission from the indium halide plasma which negatively affects its power conversion efficiency into visible light. This particular problem plagued indium halide short-arc lamps such as GE's MARC sources, and this also limits the efficacy of those high-CCT "reef" and "aquarium" MH lamps which rely on indium halide to produce white light.

On top of that, the energy conversion efficiency of the HF/microwave drivers needed to run these electrodeless lamps ranges from ~65 % for magnetrons (max value), to ~70-75 % for more modern solid-state drivers. Naturally, that lowers the overall system efficacy even further, and this is a real disadvantage when comparing overall system performances with LED and HID systems where electronic drivers operate at 90+ % efficiency...

Of course, there's the argument of the "longer service life" of these electrodeless lamp systems. In fact, this is not always the case as the typical service life claimed for these systems ranges from 25 to 50 khrs, while top-of-the-range HID lamps are now rated at 45 khrs for HPS, and 30 khrs for CMH... not to mention that electronically-ballasted HID systems often deliver a higher overall lumen efficacy too.

Now, with state-of-the-art LED systems designed for 100,000 hrs service life and delivering even better performances than the best HID systems out there, I really don't see a future for those microwave-driven "plasma" lamps. Take as many pictures of this peculiar installation as you can, George, you're more likely to see it taken down in the future rather than see this technology spread to more masts.
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Nov 21, 2016 at 02:09 PM Author: lights*plus
Thanks Max! More than interesting additional info on LEP efficacy. I'll be making attempts to get even more pics now, perhaps in the day, as they look very different from any other light sources I've come across. There are what appear small transmission boxes (with short antennae) on the 2 end masts. It was so windy on the night I shot this above pic that these don't appear well. Their location is hard to get to, as the masts are on a limited access freeway smack in the center of 2 exits.
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Nov 21, 2016 at 03:23 PM Author: Lightingguy1994
Looking at the pic, i notice a bunch of barrells at the base of each pole, what exactly are those for? My only guess would be to stop rogue cars from hitting the pole and crashing it down

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Nov 21, 2016 at 07:50 PM Author: lights*plus
Certainly the barrells are for cushioning rogue cars. They seem however to be at a strange angle to the road, something like 45°.
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Oct 21, 2018 at 06:07 AM Author: lights*plus
Max was right. These have been replaced with LED, probably in the summer of 2017. Unfortunately I had no time to get additional shots of the LEP either in the day or at night.
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