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70w HP sodium bulb: 4 yrs old. Cycles off in middle of night. Bad bulb?

70w HP sodium bulb: 4 yrs old. Cycles off in middle of night. Bad bulb?

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Old 10-29-19, 10:43 AM
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70w HP sodium bulb: 4 yrs old. Cycles off in middle of night. Bad bulb?

70 watt hi sodium barn light with photocell
 
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Old 10-29-19, 11:03 AM
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good chance it is a bad bulb.
 
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Old 10-29-19, 03:03 PM
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I've found that more often than not, if it's cycling on and off, the bulb is going bad.

When the photocell goes bad, it usually faults always on or usually always off.
 
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Old 10-30-19, 10:53 AM
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70w HP sodium bulb: 4 yrs old. Cycles off in middle of night. Bad bulb?

Probably. As HPS lamps get old they draw higher voltage causing them to cycle off and on.
 
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Old 10-30-19, 01:21 PM
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This cycling will also damage the ignitor, which provides the high voltage pulse required to strike the arc within the lamp. Replace the lamp asap, or install a new LED fixture.
Andy
 
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Old 10-30-19, 01:56 PM
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similar to replacing a 4ft florescent bulb with an LED, if you don't want to replace the fixture, you can buy an LED with the same size/shape base and just rewire the fixture to bypass the ignitor (or ballast for florescent bulbs) and go with line voltage.

https://www.1000bulbs.com/product/212295/PLT-11609.html

consider how often you need to maintain it. If you stay with the Sodium, I would replace the ignitor now so you don't another another trip up the pole or wall any time soon. That is your cheapest parts option (probably under $25). Going to LED reduces your operating costs so a direct wire bulb or new fixture is the other option. An LED bulb with a change in the fixture wiring is next on the cost scale ($50) with a full LED fixture being most expensive ($80-$100). My cost estimates are just that based on quick web searches.

- Peter
 
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