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LUCALOX 400W TD

LUCALOX 400W TD

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Couldn’t resist this cheap linear High-Pressure sodium lamp new and unused. All though this lamp has getters on one of the supports It isn’t evacuated. I suspect it may be nitrogen at low-ish pressure given the discharge colour. The arc tube would strike well before there was any danger of the outer filling breakdown.

LU400_TD.jpg NHT150SDX_a.jpg Hg_Cd_lamps.jpg Phil_Cd.jpg

Light Information

Light Information

Manufacturer:GE
Model Reference:LU400/TD
Lamp
Lamp Type:Linear High Pressure Sodium
Fixture
Socket Type:RX7s
Electrical
Wattage:400W

File information

File information

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Filename:LU400_TD.jpg
Album name:tuopeek / High Pressure Lamps
Keywords:Lamps
File Size:82 KB
Date added:Jun 26, 2019
Dimensions:2000 x 1066 pixels
Displayed:37 times
Date Time:2019:06:26 18:30:39
DateTime Original:2019:06:25 22:07:15
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Exposure Time:1/250 sec
FNumber:f 5.6
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Focal length:34 mm
ISO:280
Make:NIKON CORPORATION
Model:NIKON D3400
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dor123
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Jun 26, 2019 at 11:54 AM Author: dor123
I think usually linear HPS lamps, have argon in the outer jacket.

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 lives in Israel, which is a 230-240V, 50hz country.

tuopeek
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Tuopeek-475652085781113 tuopeek1 77334065@N05/
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Jun 26, 2019 at 01:34 PM Author: tuopeek
Possibly, at a high pressure, but from memory discharge didn't look as blue as I would have expected with argon.
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Jun 26, 2019 at 01:59 PM Author: James
Indeed the SON-TD outer bulb is filled with high pressure argon, to limit the rate at which the ceramic arc tube sublimes during operation, which causes darkening of the outer bulb. With ordinary tubular lamps the diameter is large enough that arc tube evaporation is negligible, but for SON-TD it is significant due to the smaller diameter and thicker brown coatings - which then reflect more heat and further raise the arc tube temperature and eventually lead to a thermal runaway. The high pressure argon fill limits this - nitrogen would be less effective in retarding evaporation, due to its lower molecular weight.
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Tuopeek-475652085781113 tuopeek1 77334065@N05/
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Jun 26, 2019 at 02:48 PM Author: tuopeek
Thanks James and Dor123, also explains the brown coatings I have seen on old SON/T lamps
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Jun 26, 2019 at 03:02 PM Author: Binarix128
Very unusual HPS lamp shape.

-I dont speak English very well. Compact Fluorescent (PL)
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Jun 26, 2019 at 03:07 PM Author: James
Yes correct! If the coating is brownish and near the centre of the arctube, it is usually evaporated alumina. If it is grey and in the colder areas, then it is sodium loss. In case dark grey / black it is evaporated carbon from the steel support frame, mainly a problem on cheap modern lamps.
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