High pressure sodium lamps

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Vegman
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High pressure sodium lamps

Postby Vegman » Mon Apr 07, 2014 3:34 am

Does anyone know what causes high pressure sodium lamps to come on and off intermittently?
We have a floodlight that comes on brightly for few minutes, then goes dim, but not completely out, it sputters and flickers for a while and then comes on again at full brightness. It cycles like this every three or four minutes.
I suspect that this is something to do with the ballast unit., which seems to consist of some sort of inductor and two capacitor type looking things.
Any ideas?

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JK
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Re: High pressure sodium lamps

Postby JK » Tue Apr 08, 2014 3:10 am

straight from our electrician:
Ballast is failing

Vegman
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Re: High pressure sodium lamps

Postby Vegman » Wed Apr 09, 2014 6:39 am

Thanks- I thought so- unfortunately no spares, but at least I wont have to climb the foremast, the ballast unit is at the bottom.

Vegman
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Re: High pressure sodium lamps

Postby Vegman » Sat May 24, 2014 9:28 am

Actually it turned out not to be the ballast but the lamp.
Apperently this cycling is typical behaviour for a HP sodium lamp as it nears the end of its life.
The wikipedia page on HP sodium lamps explains the electro-chemical process involved.

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JK
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Currently located: East Coast, Canada

Re: High pressure sodium lamps

Postby JK » Sun May 25, 2014 1:56 am

Thanks for the update. I guess that means you had to climb the mast?


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