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Metal Halide doing a weird discharge.

Metal Halide doing a weird discharge.


Filmed yesterday.

Whats causing the lamp inside that fixture to do that weird discharge? Could it be a bad capacitor in the fixture, or the lamp is close to EOL? And its not the camera, its actually doing this in real life.

20190127_152419.jpg 20190126_174724.jpg youtube_ef_nPKaGUr0.jpg IMAG1600.jpg

Light Information

Light Information

Lamp
Lamp Type:metal halide
Fixture
Fixture Type:parking lot fixture

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Album name:lightinglover8902 / Misc. lighting (photocells & other types of lighting in my area)
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File Size:3724 Bytes
Date added:Jan 12, 2019
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dor123
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Jan 12, 2019 at 10:38 AM Author: dor123
It is better to capture close-up video of the discharge in the lamp. I've seen pulse-start MH lamps behaves like this: https://www.lighting-gallery.net/gallery/displayimage.php?pos=-89655

Perhaps the arctube swelling and can be explode at any time.

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delaware74b
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Jan 13, 2019 at 08:41 AM Author: delaware74b
The lamp is near EOL. I see it in MH lamps operated beyond their designed life.
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Jan 13, 2019 at 10:17 AM Author: Medved
I have seen some MHs to have the arc swirling within the arctube, yielding a low frequency flicker (few Hz, no more than 10Hz), it was on rather new lamps but short while after installation or position change. After some 10's of hours the arc stabilized. Could be caused by the higher internal pressure than usual. After the position change the pool was not anymore in the coldest spot, it became warmer, so formed higher pressure. Once it was distilled to the new coldest place, the pressure drops again.
With that hypothesis, the lamp wear may caus that too (elevated temperature due to age arctube darkening)...

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Jan 13, 2019 at 11:06 AM Author: suzukir122
I've seen MH arc swirling as well. First time I saw this, was at a Shell gas station (which is still completely Metal Halide
right now) I'm not sure how that lamp is doing, though I'll find out later tonight on my way home from work, but I found
out it was swirling due to several moving shadows from inside the fixture. I'm talking really crazy amount of swirling here,
like wobbling/snaking swirls. Thing is, it did this during every operation, every night without stabilizing. Recently, I caught
another MH doing something similar, at the BP gas station (outside canopy) literally right across the street from the shell
gas station.

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Jan 13, 2019 at 10:55 PM Author: lightinglover8902
IDK, but is it rare for metal halide to have an arc swirling inside?

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