Author Topic: What is the difference between Osram Vialox and Vialox 4Y?  (Read 677 times)
John
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What is the difference between Osram Vialox and Vialox 4Y? « on: February 15, 2023, 12:53:12 AM » Author: John
I have seen some Osram high pressure sodium lamps marked "Vialox" and some are marked "Vialox 4Y". Is it just a newer version? A slight change to the construction perhaps?
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Medved
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Re: What is the difference between Osram Vialox and Vialox 4Y? « Reply #1 on: February 15, 2023, 02:32:48 AM » Author: Medved
In some way they increased the life rating to 24+khours and a mortality curve high enough, which allows 4 years replacement interval (so after about 15k hours) in group relamping schedules while still meeting the maximum 2% failure rate criteria.

Dunno if that meant a real technical lamp design change, or whether just the data collected from the field had shown the lamps already did perform that way.
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John
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Re: What is the difference between Osram Vialox and Vialox 4Y? « Reply #2 on: February 16, 2023, 05:19:20 AM » Author: John
I see so 4Y = 4 years, makes sense! I've just ordered one of each. I couldn't see a difference in the photos of the lamps. Will be interesting to see if there's any perceptible difference viewing them in person.
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Re: What is the difference between Osram Vialox and Vialox 4Y? « Reply #3 on: February 25, 2023, 10:55:29 PM » Author: John
The lamps are here and I have posted a comparison photo in my gallery! Turns out the internal construction is definitely different, especially the ignition wire.
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WorldwideHIDCollectorUSA
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HID, LPS, and preheat fluorescents forever!!!!!!


Worldwide HIDCollectorUSA
Re: What is the difference between Osram Vialox and Vialox 4Y? « Reply #4 on: February 28, 2023, 03:14:32 PM » Author: WorldwideHIDCollectorUSA
As far as I know, the Osram NAV 4Y high pressure sodium lamps have a much higher xenon pressure compared to regular Osram NAV high pressure sodium lamps. In addition, the 4Y lamps have a higher luminous efficacy compared to standard lamps.
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