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Is this bad?

Is this bad?

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It looks like there sodium down by the electrodes. What do I do?

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Filename:DSCN8460_compress62.jpg
Album name:HPSMVF / LPS lighting
Keywords:Lamps
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Date added:Sep 25, 2020
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Date Time:2020:09:25 17:26:49
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fluorescent lover 40
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Sep 25, 2020 at 05:36 PM Author: fluorescent lover 40
I'm not an expert on this, but I'd say it looks fine?

Good quality things are awesome. Cheaply made things are not.

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AngryHorse
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Sep 25, 2020 at 06:19 PM Author: AngryHorse
Run it vertical for a few hours, that will dissipate
Most of the latter Philips lamps have sodium down there!

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BT25
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Sep 25, 2020 at 06:37 PM Author: BT25

Run it vertical for a few hours, that will dissipate
Most of the latter Philips lamps have sodium down there!

Run it base up...you don't wanna be that guy from the university video!

Formerly known as WestinghouseCeramalux.

Westinghouse Lifeguard Disease...it's nothing to fear...one can treat it by buying more! :poof: :lol:
Personally, I've been dealing with it since age 5, and I'm still alive and healthy! :lol: :lol:

Globe Collector
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Sep 25, 2020 at 07:20 PM Author: Globe Collector
The "bad" situation occurs when the sodium gets right up those insulated posts that sheath the electrode lead-ins...most of my SOX lamps have ceramic collars at the tops that I presume the sodium does not stick to very well....not so sure about more modern SOX though.....but if the sodium makes electrical connection to the electrode then the arc impingement point can move from the electrode tip to the sodium splatter on the arc tube wall...the intense local heating can then thermally shock the arc tube wall cracking it and breaching the arc tube.....and, as lamp collectors this is NOT a desired outcome!

Manufactured articles should be made to be used, not made to be sold!

Fee, Fye, Fow, Fum, A dead man's eye and a parrot's BUM!

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Sep 25, 2020 at 07:24 PM Author: HPS_250
I’m not really an expert on SOX lamps either, but I’d say to run it base up to let the sodium disperse back throughout the arc tube.

I like all kinds of lighting and electrical, except for LED, which I classify as a disease.
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Save the sodium lamps!

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Sep 25, 2020 at 08:44 PM Author: Globe Collector
Yes, it does eventually because the ends of the arc tube adjacent to the electrodes are usually hotter than the rest of the arc tube due to the electrode work function voltage drop increasing the power dissipation there. This higher temperature increases the vapor pressure of the sodium and thus it slowly diffuses back down the arc tube.

Actually you don't need to tip the lamp right up vertically base up, just tilting it with the base end a bit higher than the crown end is enough because it is an evaporation-condensation process that transports the residual sodium away that does not physically run downhill away because its surface tension is strong enough to make stay and also stick to the arc tube wall.

The same process happens in a room on a winter day, where water from your warm body (mostly in your exhaled breath) condenses on the coldest part of the room. usually the window pane.

The blackening of the arc tube wall is due to damage of the thin boron oxide coating placed there to protect the glass... if this gets breached the sodium reduces the silicon in the glass..

4Na + SiO2 --> 2Na2O + Si

so the black stuff is elemental silicon. It makes the sodium stick even more, it makes the arc tube even hotter as it is black and its crystalline structure weakens the arc tube wall by creating thousands of tiny voids between the crystals that act as stress risers than can eventually penetrate down into the glass beneath.

If you look at the arc tube seals...i.e. look along under that mica disc if you can get a clear line of sight past that bloody getter....where the copper lead-ins go through, you should be able to see two things..

1. The copper is really shiny and looks just like copper, (as opposed to the copper coating on DuMet in other lamp's seals just looking dull red.)

2. If you look really carefully and can get some diffused light from the other side (past that bloody Barium getter again)...you will spot a change in refractive index in the glass that runs parallel to the copper lead-in and about 500 microns (0.5mm, c 1/64th Inch) from it on either side of it.

This is because where the lead-ins pass out of the arc tube there are actually two 1mm diameter holes right through the glass of the "press" and these are filled with boron oxide so the copper wire is fully embedded in boron oxide and does not come in contact with the glass anywhere...and this is why the copper is so shiny, it is "wetted" well by boron oxide but does not react with it at all so it stays perfectly shiny (unlike in DuMet seals where it comes in contact with the silica in the glass and reacts to form red silicates and oxides) ...and the change in refractive index is the contact between the glass and boron oxide.

The boron oxide coating continues on around the lead-ins inside the arc tube too and eventually stops at the ceramic collars just behind the electrodes or just stops without the collars...sort of like the way insulation on a cabe ends or the myelin sheath on a nerve.

If you have an intact arc tube from a broken SOX lamp and you keep it in a damp place...the boron oxide that slightly protrudes around where the four copper lead-ins exit...slowly reacts with the moisture in the air to make water soluble boric acid, (boracic acid).

B2O3 + 3H2O ---> 2H3BO3

Slowly, over time, all the boron oxide eventually reacts and the arc tube eventually breaches and the air rushes in. This is why, if you have any older low pressure sodium lamps with bare arc tubes that fit into Dewer Flasks...like old SO-H's, you have to keep them in a good dry spot.

Manufactured articles should be made to be used, not made to be sold!

Fee, Fye, Fow, Fum, A dead man's eye and a parrot's BUM!

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Sep 26, 2020 at 03:15 AM Author: AngryHorse

Run it base up...you don't wanna be that guy from the university video!

yeah sorry, forgot to clarify that!

Current: UK 230V, 50Hz
Power provider: e.on energy
Street lighting in our town: Philips UniStreet LED

"Beauty fades, dumb is forever".......Judge Judy :D

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Low pressure sodium lights are awesome!!!!!!!


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Sep 26, 2020 at 06:28 PM Author: HPSMVF

Run it base up...you don't wanna be that guy from the university video!

I never ran it base down to begin with.

I am 12 years old and I love to collect lights.

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Sep 26, 2020 at 08:44 PM Author: BT25

I never ran it base down to begin with.

Not saying you did!

Formerly known as WestinghouseCeramalux.

Westinghouse Lifeguard Disease...it's nothing to fear...one can treat it by buying more! :poof: :lol:
Personally, I've been dealing with it since age 5, and I'm still alive and healthy! :lol: :lol:

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Sep 27, 2020 at 02:32 AM Author: TL buis
Sometimes the sodium becomes on Emitter,then this will happen. Run lamp vertical( Base up) for a few days and will slowly dissapear..Seen before
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Low pressure sodium lights are awesome!!!!!!!


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Sep 27, 2020 at 03:38 PM Author: HPSMVF

Not saying you did!

sorry

I am 12 years old and I love to collect lights.

HPSMVF
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Low pressure sodium lights are awesome!!!!!!!


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Oct 01, 2020 at 09:45 AM Author: HPSMVF
Now I broke the lamp I put it in a package for safekeeping but I didn't realize the package was ripped, and a lamp smashed on the ground. The inner art tube is ok so thank God it didn't cause a fire. i will get the 55 watt sox lamp on ebay.

I am 12 years old and I love to collect lights.

fluorescent lover 40
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Oct 01, 2020 at 09:58 AM Author: fluorescent lover 40
That's a shame, hopefully you can get a new one.

Good quality things are awesome. Cheaply made things are not.

Collector of lights and anything else that interests me as long as I have space for that particular thing!

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Oct 01, 2020 at 10:03 AM Author: sox35

Now I broke the lamp I put it in a package for safekeeping but I didn't realize the package was ripped, and a lamp smashed on the ground. The inner art tube is ok so thank God it didn't cause a fire. i will get the 55 watt sox lamp on ebay.

Oh no

Ria in Aberdeen
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Low pressure sodium lights are awesome!!!!!!!


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Oct 01, 2020 at 01:06 PM Author: HPSMVF

Oh no

I know it sucks. I'm so mad.

I am 12 years old and I love to collect lights.

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Oct 01, 2020 at 01:21 PM Author: sox35
One less SOX lamp in the world is a sad thing

I declare a minute's silence to mourn the passing of this wonderful lamp

Ria in Aberdeen
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Oct 01, 2020 at 01:28 PM Author: Metal Halide Boy

I know it sucks. I'm so mad.


I am so sad for you.
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Low pressure sodium lights are awesome!!!!!!!


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Oct 01, 2020 at 01:49 PM Author: HPSMVF
Good news, I'm getting the 55 watt low pressure sodium lamp off eBay. I broke the lamp underwater, I really wanted to keep it but I saw that the art tube had a little crack in it and I was scared air will causes sodium to go off.

I am 12 years old and I love to collect lights.

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Oct 01, 2020 at 02:10 PM Author: sox35
The amount of sodium in a lamp is nothing, anyway it's the water that it reacts with; try chucking a 3lb lump into a swimming pool and see what happens

Ria in Aberdeen
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Low pressure sodium lights are awesome!!!!!!!


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Oct 01, 2020 at 02:21 PM Author: HPSMVF

The amount of sodium in a lamp is nothing, anyway it's the water that it reacts with; try chucking a 3lb lump into a swimming pool and see what happens

it was a pretty big explosion when I broke it

I am 12 years old and I love to collect lights.

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Low pressure sodium lights are awesome!!!!!!!


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Oct 02, 2020 at 11:04 AM Author: HPSMVF
I just bought a new one

I am 12 years old and I love to collect lights.

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Oct 02, 2020 at 11:11 AM Author: sox35
Yaaaaaay..!!!!!

Ria in Aberdeen
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Low pressure sodium lights are awesome!!!!!!!


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Oct 02, 2020 at 05:26 PM Author: HPSMVF

Yaaaaaay..!!!!!

I'll make sure to be extra careful with this one LOL.

I am 12 years old and I love to collect lights.

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Oct 02, 2020 at 05:50 PM Author: HPS_250
It’s sad that this lamp got smashed.
Hopefully your new one arrives safely, I’m glad you were able to get a replacement.

I like all kinds of lighting and electrical, except for LED, which I classify as a disease.
- HID lamp and fixture collector
- Vintage incandescent lamp collector
Power Company: Southern California Edison
Proudly suffering from Westinghouse Lifeguard sickness since 2019.
Save the sodium lamps!

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