Author Topic: Why do HPS lamps go green?  (Read 552 times)
HM1000
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Why do HPS lamps go green? « on: October 12, 2022, 04:08:23 PM » Author: HM1000
I am wondering why HPS lamps go green. Anyone have any ideas?
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Re: Why do HPS lamps go green? « Reply #1 on: October 12, 2022, 05:21:07 PM » Author: LightsoftheWest
It's because the sodium vapor gives the lamp its orange glow. Once the sodium leaks out, all that's left is mercury and argon, which is what's used as the starting aid.
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Re: Why do HPS lamps go green? « Reply #2 on: October 12, 2022, 05:21:44 PM » Author: HM1000
Oh, Ok! Thanks!
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Re: Why do HPS lamps go green? « Reply #3 on: October 12, 2022, 05:23:51 PM » Author: LightsoftheWest
Of course!
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Re: Why do HPS lamps go green? « Reply #4 on: October 12, 2022, 06:27:10 PM » Author: 70HPS
I have a Lucalox 70 that glows green when first turned on.
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Re: Why do HPS lamps go green? « Reply #5 on: October 13, 2022, 02:30:05 AM » Author: Medved
@70HPS: When new, the sodium is within the amalgam, but the mercury does evaporates to some extent, so once powered on, first there is just the buffer gas and Hg in the arc, until the sodium evaporates.

Never seen this effect with HPS (although I don't see that to be just a coincidence with certain lamp design), but I see it as quite common with many MH's.
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Re: Why do HPS lamps go green? « Reply #6 on: October 13, 2022, 09:16:39 AM » Author: HM1000
yeah and it stays green all the time
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Re: Why do HPS lamps go green? « Reply #7 on: October 13, 2022, 01:07:44 PM » Author: dor123
Non-cycling HPS lamp, that lost all of the sodium. Regular HPS lamps can't reach to this state.
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