Econolite03
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Matthew E.
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| I have two Philips 135W SOX lamps, NOS from May of 2018. Both have no defects, same shipping box, and perfectly fine getters. Both lamps have been tested and work properly and warm up as expected.
But here’s the question; one has the tube crystal clear around the electrodes (like it’s never been burned), and one has the typical blackening seen on almost every NOS Philips I’ve owned. Is this just an inconsistency in manufacturing or something else?
Please let me know.
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Baked bagel 11
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Tom
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| My 90w nos philips 2017ish lamp has blackening IIRC (I'm not in Canberra at the moment).
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Long live the Cobra Heads of America!
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AngryHorse
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Rich, Coaster junkie!
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| Yes it’s just manufacturing 😎, I’ve had 18 watters the same, one leg of the tube is clear, the other heavy with getter.
You can see the differences amongst them here.
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« Last Edit: December 31, 2024, 01:47:42 PM by AngryHorse »
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Current: UK 230V, 50Hz
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Street lighting in our town: Philips UniStreet LED (gen 1)
Longest serving LED in service at home, (hour count): Energetic mini clear globe: 57,746 hrs @ 15/12/24
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RRK
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Roman
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| Interesting. We had a deep discussion here, and James said this blackening is extra barium evaporated from filaments at some stage of arctube filling. Originally it was controlled by a photo control on the production line and when this failed management decided not to repair the sensor, cause SOX manufacturing was considered close to EOL anyway. So arctubes were left with some excessive Ba coating.
My be the lamps are just from the exact time period when photo control failed, or arctubes used are from some different stocks.
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« Last Edit: January 01, 2025, 06:25:45 AM by RRK »
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AngryHorse
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Rich, Coaster junkie!
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| Definitely! 🤔, the ones in the above photo all turned out to be a box full of duds!, don’t know if it was in anyway related, but the IR coating all went black on these within the first 2 years! 😩
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Current: UK 230V, 50Hz
Power provider: e.on energy
Street lighting in our town: Philips UniStreet LED (gen 1)
Longest serving LED in service at home, (hour count): Energetic mini clear globe: 57,746 hrs @ 15/12/24
Welcome to OBLIVION
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RRK
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Roman
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| Do you know what causes IR coating to blacken? IRC is typically indium-tin oxide, rather robust material, that should not decompose under relatively mild SOX lamp operation. Some sodium slowly leaking and reducing it?
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Baked bagel 11
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Tom
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@AngryHorse- Sad to hear they were duds.
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Long live the Cobra Heads of America!
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