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COBR-Polam LRJD 400W

COBR-Polam LRJD 400W

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This is an unusual Polish metal halide lamp from the R&D Laboratory of POLAM, many thanks to Bartek! The suffix 'D' of the name LRJD would normally indicate Daylight colour, however the colour of this lamp is not white. It is about 8000K and slightly greenish. The mechanical construction is almost identical to Osram HQI-T lamps of the 1970s, it is clearly copied from that company's products. However while Osram lamps are filled with Dysprosium-Thallium-Caesium and give a good daylight quality light of very high colour rendering, this Polam lamp contains far more thallium (green), and also indium (blue). Due to the strongly coloured light the colour rendering is not especially good, a little under 60, and there is strong separation of colours along the length of the arc. The efficacy is rather low for a metal halide lamp, just 72 lm/W. It is not known what application this lamp was made for - perhaps some medical or photochemical use. It would certainly not make a good lamp for general lighting due to the poor colour and low efficacy.

CMH-PC45.JPG D_MHQ_Svetotekhnika_DRI175.jpg D_MHQ_Polam-COBR_LRJD400.jpg D_MHQ_Polam-COBR_LRJD400_lit.jpg

Light Information

Light Information

Manufacturer:COBR Polam
Model Reference:LRJD
Lamp
Lamp Type:Metal Halide
Base:E40
Shape/Finish:T-46
Service Life:Unknown
Fixture
Ballast Type:Mercury 400W
Electrical
Wattage:370W
Voltage:115V
Current:3.5A
Optical
Lumen Output:26,500
Lumen Efficacy:71.5 lm/W
Color Temperature:8000K
Color Rendering Index:60
Physical/Production
Factory Location:Warsaw, Poland
Fabrication Date:1997 December
Application/Use:Unknown

File information

File information

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Filename:D_MHQ_Polam-COBR_LRJD400.jpg
Album name:James / Metal Halide
Keywords:Lamps
File Size:101 KB
Date added:May 15, 2016
Dimensions:1181 x 787 pixels
Displayed:152 times
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Comments
elek
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May 09, 2019 at 10:15 AM Author: elek
LRJD lamps were produced in small scale by COBR Polam, never went to mass production. As far as I currently know lamps meeting design criteria (P=360W, I=3,5A, 70-80lm/W, CRI>85, CCT=6000K) were sold and used in general lighting, sometimes they appear on local internet auctions but it is very rare ocasion. Lamps outside this specification were much more common and those were sold at much lover price eg. for growing plants. This particulary LRJD is almost certainly that kind of "failed" lamp.
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Tuopeek-475652085781113 tuopeek1 77334065@N05/
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May 09, 2019 at 02:34 PM Author: tuopeek
Unused and lovely build quality. They have gone to town with the gettering.
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