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Bulged capacitor

Bulged capacitor

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This nice BT-shaped crapacitor came from one of my 175w CWA metal halide ballasts. Yesterday I was running my vintage Sylvania /W off it for several hours, got distracted and came back to find the lamp burning at low brightness and the arc was snaking in circles. While that looked cool, it did cause major electrode sputtering & arc tube blackening on my precious rare & vintage lamp. So I learned a lesson never to leave a vintage lamp running unattended. I figured from the symptoms the cap had failed, though I've never had that happen before and didn't expect that from a newer ballast. I didn't even have to test it: the bulged case was an obvious tip-off. I have a new one on order (metal case) but I hope I didn't take too many years off my lamp's life!

LOA 35w HPS gear+.jpg image~2.jpeg IMG_3280.JPG Series Constant Current Regulator+.JPG

Light Information

Light Information

Manufacturer:Aerovox
Model Reference:213671
Lamp
Shape/Finish:BT-14
Service Life:Too short
Electrical
Wattage:10uF
Voltage:400
Physical/Production
Factory Location:USA

File information

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Filename:image~2.jpeg
Album name:arcblue / Ballasts and ignitors
Keywords:Gear
File Size:98 KB
Date added:Sep 12, 2018
Dimensions:1006 x 674 pixels
Displayed:129 times
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lightinglover8902
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Sep 12, 2018 at 02:45 PM Author: lightinglover8902
Definitely do not use this.

sol
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Sep 12, 2018 at 05:23 PM Author: sol
Wow. I suppose some modern dry caps can fail early. Since I don't have to pay for bad power factor, I much prefer NPF for HID ballasts because you don't need a cap. One less component to fail. That said, i do have some HPF HID ballasts in use and no problem so far. I do have some HX-HPF ballasts kits that have the cap loose in the box, so I probably won't use them when the time comes.
streetlight98
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Mike McCann


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Sep 12, 2018 at 07:40 PM Author: streetlight98
If it is indeed just sputtering, it may burn off once you run the lamp at proper power for a couple hours. Odds are it didn't cause permanent damage to the lamp. MV lamps are pretty flexible with how they're driven. I agree with sol, not a fan of ballasts that have capacitors. I exclude them from the fixture wiring when I have the choice (HX and reactor ballasts). With CWA you haven't got a choice though.

To resist is to piss in the wind, anyone who does will end up smelling.

WestinghouseCeramalux
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Sep 12, 2018 at 10:19 PM Author: WestinghouseCeramalux
I second Mike. Just run the lamp for a while and it should clear up. I've done this before and has success. Good luck.

Do not argue with an idiot.  They will drag you down to their level and beat you with experience.

Lightingguy1994
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Sep 12, 2018 at 11:19 PM Author: Lightingguy1994
Wow that looks like its ready to go bang, I bet if you smashed it on a brick wall it would explode there must be pressure inside
dor123
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Sep 13, 2018 at 02:56 AM Author: dor123
This is a good situation of a dead capacitor. See here for way more dangerous situation.

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 hope that LED won't replace all forms of other light

rjluna2
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Robert


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Sep 13, 2018 at 05:22 AM Author: rjluna2
That's not good

Pretty, please no more Chinese failure.

arcblue
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Oct 01, 2018 at 05:54 PM Author: arcblue
WestinghouseCeramalux, you were right, after capacitor replacement and running the lamp for many hours the blackening did clear up some. Not perfect but the lamp does have some hours on it anyway. Seems to be working fine.

I'm happy the capacitor didn't blow its innards. I just had a small capacitor blow in an HPS electronic ballast, and it shows burned solder traces and released soot on the inside of the fixture housing, plus the exterior of the capacitor was very deformed/melted. Usually electrolytics I've had that fail simply bulge and crack open on their tops (vents)...at least it makes it easy to see what has failed! With a transistor, it's often not so obvious...

I'm lampin...

ace100w120v
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Oct 01, 2018 at 11:47 PM Author: ace100w120v
I haven't really had violent capacitor failures (or even CFL meltdowns) but I've had some power tools burn up. It's a smell you will never forget.
dor123
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Oct 02, 2018 at 05:05 AM Author: dor123
This is relatively good situation for a shorted capacitor. See here for a way more dangerous situation of a shorted capacitor .

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 hope that LED won't replace all forms of other light

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