My Osram NAV-TS 70W Super 4Y blackens very fast « on: January 15, 2025, 09:40:29 AM » Author: dor123
I've my Osram NAV-TS 70W Super 4Y Slovakian HPS lamps for about 2 years since 10.11.2022, and despite not always using it + being a super HPS lamp with a 400 torr xenon pressure, it developed blackening very fast as you can see in the attachment. Why this is happening?
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I"m don't speak English well, and rely on online translating to write in this site.
Please forgive me if my choice of my words looks like offensive, while that isn't my intention.

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I lives in Israel, which is a 220-240V, 50hz country.

	Re: My Osram NAV-TS 70W Super 4Y blackens very fast « Reply #1 on: January 15, 2025, 11:16:21 AM » Author: Medved
Is it real blackening, or just so e spilled amalgam? In other words is it present also when running and warmed up? Otherwise most lamps exhibit some kind of "burn in" after the first about 100 hours, it may just be that...
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	Re: My Osram NAV-TS 70W Super 4Y blackens very fast « Reply #2 on: January 15, 2025, 11:41:17 AM » Author: dor123
That picture was taken shortly after turning off the lamp and waiting for the thermal afterglow to disappear. Picture of the lamp at full brightness.
« Last Edit: January 15, 2025, 11:43:37 AM by dor123 »		Logged

I"m don't speak English well, and rely on online translating to write in this site.
Please forgive me if my choice of my words looks like offensive, while that isn't my intention.

I only working with the international date format (dd.mm.yyyy).

I lives in Israel, which is a 220-240V, 50hz country.

	Re: My Osram NAV-TS 70W Super 4Y blackens very fast « Reply #3 on: January 15, 2025, 04:32:08 PM » Author: Medved
It is a matter of fractions of a second for the Hg-Na amalgam to condense into a haze on the arctube wall, mainly close to the ends where it is already colder, normally it is operating there practically at the border of condensation (saturated vapor), so the temperature does not need to change at all for it to condense a bit. The tube in the full brightness picture seems to me clean, but it would be better to take it via some filter (welding glass,...), so the camera won't saturate...
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	Re: My Osram NAV-TS 70W Super 4Y blackens very fast « Reply #4 on: January 16, 2025, 11:03:37 AM » Author: dor123
@Medved: You won't be able to see the blackening through a filter like an ND one.
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I"m don't speak English well, and rely on online translating to write in this site.
Please forgive me if my choice of my words looks like offensive, while that isn't my intention.

I only working with the international date format (dd.mm.yyyy).

I lives in Israel, which is a 220-240V, 50hz country.