Author Topic: Why electronic ballasts for HPS lamps, changing their frequency during starting?  (Read 199 times)
dor123
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Why electronic ballasts for HPS lamps, changing their frequency during starting? « on: June 30, 2025, 07:52:05 AM » Author: dor123
The question is in the subject. See this video for example: https://www.lighting-gallery.net/gallery/displayimage.php?pos=-251959
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Re: Why electronic ballasts for HPS lamps, changing their frequency during starting? « Reply #1 on: June 30, 2025, 08:28:35 AM » Author: Medved
Could be just a side effect of the way how they are implemented...
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Re: Why electronic ballasts for HPS lamps, changing their frequency during starting? « Reply #2 on: June 30, 2025, 08:54:52 AM » Author: dor123
This don't occurs with my Philips HID-PrimaVision PV C 70 /S CDM electronic metal halide ballast, when I put my Osram NAV-TS 70W Super 4Y HPS lamp inside my tracklight and turning it on.
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Re: Why electronic ballasts for HPS lamps, changing their frequency during starting? « Reply #3 on: June 30, 2025, 01:23:33 PM » Author: Medved
Why should both behave the same on any parameter that would not matter at all? They are two independent designs, maybe driving the lamp the same way in their principle (a commutating polarity DC), but otherwise designed by different people, so ending using different circuits, with different behavior on aspects that do not matter at all, just because particular way became simpler for a given circuit.

If the frequency would be of any importance, you would see both behaving in a similar manner.
Like they are very likelybehaving very similar way when speaking about arc current vs arc voltage dependencies and so on.

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