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Extra High Voltage Obstruction Balls (Illuminated?)

Extra High Voltage Obstruction Balls (Illuminated?)

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These are for aircraft pilots to avoid collision with power lines. There are red and white balls alternating.
IIRC, they glow at night but I'm not sure what makes them glow. This is anchor cable (not energised).

dimmed.jpg grymk1.jpg obstr.jpg krizik_switchboard.jpg

Light Information

Light Information

Lamp
Lamp Type:?
Fixture
Fixture Type:obstruction object
Location:near Zdice, Czech rep.
Physical/Production
Application/Use:aircraft safety

File information

File information

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Filename:obstr.jpg
Album name:merc / Off Topic
Keywords:Off-Topic
File Size:358 KB
Date added:May 15, 2018
Dimensions:1199 x 803 pixels
Displayed:159 times
Date Time:2018:05:15 22:23:21
DateTime Original:2018:04:30 13:14:30
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Exposure Time:1/350 sec
FNumber:f 0
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Focal length:135 mm
ISO:100
Make:PENTAX
Model:PENTAX K-m
Software:GIMP 2.8.16
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URL:https://www.lighting-gallery.net/gallery/displayimage.php?pos=-146433
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Cole D.
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123 V 60 CPS


Dk944Mr-jX4jbnoUUj7xAw
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May 15, 2018 at 08:17 PM Author: Cole D.
We have those here too in the United States, I've seen them near the airports and airstrips. I didn't know that they glow though, that's interesting.

Collect vintage incandescent and fluorescent fixtures. Also like HID lighting and streetlights.

merc
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Adam


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May 16, 2018 at 11:21 AM Author: merc
I'm not sure about this particular type but I've seen similar balls glowing. The glow wasn't too strong (maybe like there was a 15W incandescent inside?) but probably enough to be spotted by a pilot in the darkness.

Not a misoLEDist...

Ash
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May 16, 2018 at 01:40 PM Author: Ash
We have similar looking balls here and they dont glow. On lines that are a problem for aircraft, lighted Red lights are installed at the top of the poles, those are powered by solar panels from what i seen

In your pic, if they would be hanging on a Phase wire, then just a Neon lamp with one lead connected to the Phase and the other to a short antenna would be sufficient. If hanging on the Earth wire, maybe a longer antenna would still pick enough from the nearest Phase to light up a Neon, not sure

Or they could be Solar+LED (with some very good quality batteries !)
merc
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Adam


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May 16, 2018 at 02:16 PM Author: merc
Or the paint is the luminous one.

I couldn't find a single pic of these glowing so it indeed could have been just an optical illusion what I've seen. As it was on suburbs, maybe it was just a reflection.

Not a misoLEDist...

Ash
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May 17, 2018 at 11:59 AM Author: Ash
Most ZnS and SrA compositions glow in Green, are not bright, and i think aren't very UV stable

About the UV part, i dont know if its actually the ZnS that decomposes, or that it's presence makes UV damage to the Plastic it's embedded in more visible. I think it's the ZnS

My observation is this : In years gone by, there were ZnS doped push button (momentary) switches made here. When new (or when was installed in a dark place), the button color is pale Green. When worn out by exposure to Sun light (even indirect), the button becomes dark Green-ish Purple-ish and loses its output. Some of those switches were made of Polycarbonate that is known to be UV unstable material, but some were made of Phenol/Formaldehyde and this material is actually very much stable, so it's probably the ZnS inside it that's decomposing
Lightingguy1994
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Jun 21, 2018 at 12:09 AM Author: Lightingguy1994
Have these in Canada too, I've seen them on the power line wires beside Highway 17 heading away from Ottawa. The ones we have are Orange with a white X on them and there appears to be one every 20 meters or more
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