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Tool Talk Discussion Forum

high pressure sodium light

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Chris Jones

10-01-2007 19:00:42




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My folks high pressure sodium lamp comes on and seems fine but after 15 or 30 minutes it goes off. It stays off 30 to 60 seconds and then comes back on. It repeats this. Would this indicate the bulb is going bad or the fixture? There is no photocell used with this fixture.




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DickelDawg

10-03-2007 08:44:09




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 Re: high pressure sodium light in reply to Chris Jones, 10-01-2007 19:00:42  
As DaveK(IN) says, it is the typical "end-of-life" cycle for the lamp. If this situation persists for too long, the ballast will fail because as someone else said the ballast has just so many restrikes before IT fails. Sooooo..... ..the cure is to change the lamp as soon as you notice it beginning to cycle. If this doesn't happen then you can change the lamp and the ballast.
Hope this is of some help!

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S. Crum

10-02-2007 05:08:40




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 Re: high pressure sodium light in reply to Chris Jones, 10-01-2007 19:00:42  
Most likely the bulb. I had 3 bulbs changed at work last week due to this. Pretty common when these have several years on them.



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Bob

10-01-2007 23:02:36




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 Re: high pressure sodium light in reply to Chris Jones, 10-01-2007 19:00:42  
It really DOESN"T matter WHAT is wrong, as you can probably buy a whole new fixture for what a lamp, a ballast, or an "ignitor" will cost.

SAD, but true, it's really not "cost effective" to repair ANYTHING anymore!



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RobMD

10-02-2007 13:45:20




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 Re: high pressure sodium light in reply to Bob, 10-01-2007 23:02:36  
Bob, that's absolutely retarded, isn't it?

I was going to home depot to get a new photovoltaic cell and a bulb for my old lamp. the bulb was 14 bucka and the cell was 8 bucks. Looked at the new fixtures, and they were 25 bucks.

I went home with the fixture and sold the other light for scrap on a salvage yard run.

Absolutely retarded.



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Chris Jones

10-02-2007 16:27:12




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 Re: high pressure sodium light in reply to RobMD, 10-02-2007 13:45:20  
I agree but if it's the bulb it's $20. If it's anything else I'd replace the lamp which is $70-$80.

$20 is expensive to try but much cheaper than $70. Since two folks here have responded that the behavior I've described is common at bulb life end I told them to get a new bulb and try that.



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DaveK(IN)

10-01-2007 20:38:34




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 Re: high pressure sodium light in reply to Chris Jones, 10-01-2007 19:00:42  
This is a typical end of lamp life failure mode. Replace the lamp or you will toast the ignitor which has a finite number of lamp strikes in its design. How old is the fixture. These lamps have a burn life of 20,000 hours if not cycled too much.



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kito169

10-01-2007 19:48:37




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 Re: high pressure sodium light in reply to Chris Jones, 10-01-2007 19:00:42  
Sounds like a ballast to me.



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