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Spectral lamp fail

Spectral lamp fail

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I have had this little used low pressure Mercury spectral lamp for years. It would not start on the normal ballast circuit when I tried to use it at a demonstration. There are no visible marks/ cracks in either the outer or inner envelopes. I wonder if it has lost a starter gas. I can light it with 1.5kV and it will remain lit until 325V, but no chance of starting it with the normal leak ballast or even an ignitor. I can’t think of any other reason for the failure other than absorbed or escaped starter gas. The mercury spectral lines are still present when it runs. May be a lesson on running lamps now and again.

SO_electrodes.jpg neon2.jpg lp_hg_spectral.jpg neon~0.jpg

Light Information

Light Information

Manufacturer:Philips
Model Reference:Hg Spectral lamp
Lamp
Base:es
Physical/Production
Factory Location:Belgium
Fabrication Date:1982 I think

File information

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Filename:lp_hg_spectral.jpg
Album name:tuopeek / Low Pressure Lamps
Keywords:Lamps
File Size:97 KB
Date added:Jul 30, 2015
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Date Time:2015:07:30 15:33:18
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dor123
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Jul 30, 2015 at 09:00 AM Author: dor123
Air poisoning or manufacturing defect?

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 European date format (dd.mm.yyyy).

I hope that LED won't replace all forms of other light

tuopeek
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tuopeek 111967450636623837217 tuopeek1 77334065@N05/
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Jul 30, 2015 at 09:39 AM Author: tuopeek
It was working fine 20 years ago, and the spectrum looks like mercury when started. If air has got in there's not much.
dor123
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Jul 30, 2015 at 10:50 AM Author: dor123
In fluorescent lamps, air poisoning causes the lamps to go a dim red or pink color, which consists of dim mercury lines and moleculus O2 and N2 bands.
It is also possible that this lamp went mercury starved.

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 European date format (dd.mm.yyyy).

I hope that LED won't replace all forms of other light

Solanaceae
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GoL Solanaceae.Keif.Fitz Keif Fitz bubby_keif
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Jul 30, 2015 at 10:57 AM Author: Solanaceae
Try heating it in the oven. I did that and it revived a cycling 100w HPS lamp.

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sailormoon_01_uk
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Jul 30, 2015 at 01:11 PM Author: sailormoon_01_uk
also if this lamp is a Low Pressure Mercury Lamp it only going to give 75 Lumens, where the High Pressure Version gives 3800 Lumens, you can try lighting this on a European 70w HPS/Metal Halide Ballast and 2 wire Ignitor such as the Philips SI51 failing this a set of 90w SOX Gear.
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GoL Solanaceae.Keif.Fitz Keif Fitz bubby_keif
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Jul 30, 2015 at 01:40 PM Author: Solanaceae
These lamps may suffer from bad end seals or the gas runaway effect that Lps lamps undergo after some time.

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tuopeek
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tuopeek 111967450636623837217 tuopeek1 77334065@N05/
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Jul 30, 2015 at 01:43 PM Author: tuopeek
I tried it on both a 90W SOX ballast as standard then with a 2 wire SON ignitor to no avail. It would light on a NST but the current was too low. I decided to heat it gently on a Variac controlled and resistive ballasted MOT . The resistor ballast burnt out quite quickly and no improvement was made to the lamp. Perhaps the lamp is mercury starved although a small amount is visible condensed behind one cathode.
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Jul 30, 2015 at 06:53 PM Author: don93s
Are those escaped mercury droplets down toward the bottom of the stem press?
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tuopeek 111967450636623837217 tuopeek1 77334065@N05/
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Jul 31, 2015 at 11:51 AM Author: tuopeek
The mercury appears not to have escaped just condensed behind the electrode, but there is not much, so starvation may be the issue.
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