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Osram NaT 200W-3

Osram NaT 200W-3

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Unusual German design of linear low pressure sodium lamp, with much greater length and diameter than the British versions combined with a discharge tube having shorter grooves than normal. This is believed to have been the most efficient linear sodium lamp ever produced, thanks to its large dimensions and low current density. The length is the same as a 4ft fluorescent tube, but the diameter is considerably larger at 45mm.

The gas filling is a peculiar krypton-argon-neon mixture which achieves a low arc voltage and enables the lamp to be operated on 220V mains with a simple choke-type ballast combined with a fluorescent type glow-starter. This raised system efficacy still further above other low pressure sodium lamps, by eliminating the lossy autotransformer type ballasts.

The heat reflection coating is of indium-tin oxide as on SOX lamps, but most thoughtfully a small ring has been left uncoated near to each end, thereby preventing electrification of the coating and electrophoresis of the sodium through the arc tube wall.

Due to the low arc voltage the discharge current is rather high, and the electrodes are consequently rather large. They are equipped with molybdenum anode plates to reduce the loading on the cathode coil and extend its life.

Despite the exceptionally high performance, the deep yellow colour of low pressure sodium lamps never became very popular in Germany, and this lamp was phased out in 1985.

Further details at http://lamptech.co.uk/Spec%20Sheets/D%20SLP%20Osram%20NaT200W-3.htm

D SLP Osram NaT200W-3 lit.jpg D SLP Osram NaT200W-3 arctube.jpg D SLP Osram NaT200W-3 etch.jpg D SLP Osram NaT200W-3 end.jpg

Light Information

Light Information

Manufacturer:Osram
Model Reference:NaT 200W-3
Lamp
Lamp Type:Sodium Low Pressure
Base:G13
Shape/Finish:T-45
Service Life:7,500 hours
Fixture
Fixture Type:Modified 4ft T12 fluorescent
Ballast Type:Choke
Electrical
Wattage:200 W
Voltage:90 V
Current:2.3 A
Optical
Lumen Output:31,000 lm
Lumen Efficacy:155 lm/W
Color Temperature:1700K
Color Rendering Index:-44
Physical/Production
Dimensions:1200mm / 4ft
Factory Location:Berlin Charlottenburg, Germany
Fabrication Date:1978 July
Application/Use:Streetlighting

File information

File information

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Filename:D SLP Osram NaT200W-3 lit.jpg
Album name:James / Sodium Low Pressure
Rating (2 votes):
Keywords:Lamps
File Size:118 KB
Date added:Jun 11, 2018
Dimensions:1181 x 787 pixels
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F96T12 DD VHO
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Jun 11, 2018 at 02:42 PM Author: F96T12 DD VHO
Loved to see the lamp lit and is the top photo blue because of the mercury discharge that comes first?

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Jun 11, 2018 at 04:15 PM Author: rjluna2
Cool

Is the bottom fully run up?

Pretty, please no more Chinese failure.

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Mainly the electrical side of things


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Jun 11, 2018 at 04:30 PM Author: MissRiaElaine
Oooh, this is nice Still waiting to get my sticky paws on a linear lamp.

Ria in Aberdeen

I don't disapprove of LED's for domestic and other indoor use, I just don't like them for street lighting.

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Jun 12, 2018 at 12:04 AM Author: Silverliner
Looks like waveforms on an oscilloscope. Very nice lamp James. I keep learning about lamps!

May all the great lighting technologies have their place in history.

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Jun 12, 2018 at 07:40 AM Author: Andy
That's a beautiful lamp you have found James!
Such a shame they are so rare.

My main area of interest is vintage fluorescent and mercury lamps. Always interested in doing lamp trades - just let me know! Smiley

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Jun 12, 2018 at 07:45 AM Author: Danny
What a shame these were phased out so long ago it would of been amazing to see these kicking about. Amazing lamp
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Jun 12, 2018 at 07:46 AM Author: MissRiaElaine

What a shame these were phased out so long ago it would of been amazing to see these kicking about. Amazing lamp

Absolutely, they are some of my favourite lamps, just wish I could find one at a reasonable price

Ria in Aberdeen

I don't disapprove of LED's for domestic and other indoor use, I just don't like them for street lighting.

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Jun 12, 2018 at 02:50 PM Author: AngryHorse
I`m so glad our little town was blessed with the linear back in the early 80s , 90% of them were all GEC stuff too!

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Jun 12, 2018 at 03:22 PM Author: James
The discharge is blueish because of the krypton-argon gas filling - there is no mercury in here.
The bottom photo is fully run up but looks a little blotchy due to some patches of sodium condensation on the glass.
Indeed really a shame the linear sodiums disappeared so long ago, one of the most technically interesting lamps with such an unusual appearance.
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Jun 13, 2018 at 12:41 AM Author: dor123
Why the British and Philips, didn't adopted the krypton-argon-neon in their SLI/H and SOX lamps, if it was superior to neon-argon and xenon-argon-neon?

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

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Jun 13, 2018 at 05:58 AM Author: rjluna2

The bottom photo is fully run up but looks a little blotchy due to some patches of sodium condensation on the glass.

Thanks, James

Pretty, please no more Chinese failure.

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Jun 13, 2018 at 04:16 PM Author: James
Good question dor, I think this would have made a technical improvement in efficacy : but it would also change the electrical characteristics and require the introduction of new ballasts - and leave no replacements for all the existing luminaires.

Osram was lucky that when it made the change there were hardly any of their first lamps in actual installations, so there was less of a legacy to have to handle. Nevetheless they were forced to produce both versions for many years until the old design was finally dropped.
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