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Mesko OURJ-400

Mesko OURJ-400

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400W MH derivative of ORZ-6 fixture for 400W MV. Physically OURJ fixtures can be distinguished from ORZ by the presence of a hole in the body for a bimetallic starter. As MH lamps require HV pulse to ignite, to generate such pulse those fixtures have a 0.5uF cap, a resistor and a special bimetallic starter for 400W. Cap, resistor and the starter are in series with each other and the whole unit of those 3 elements is in parallel to the lamp. Those fixtures here are converted to 250W MV.

IMG_2503.JPG IMG_2510.JPG IMG_7524.JPG IMG_7538.JPG

Light Information

Light Information

Manufacturer:Mesko

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Filename:IMG_7524.JPG
Album name:trojmiejski / Lanterns in Poland
Keywords:Lanterns
File Size:166 KB
Date added:Jan 29, 2019
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Date Time:2018:10:19 14:24:50
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dor123
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Jan 29, 2019 at 10:13 PM Author: dor123
I think that the said bi-metallic starter, is a low voltage one (750-1000V) for probe-start MH lamps, as pulse-start MH lamps usually requires 4-5V ignitors, and bi-metallic starters usually don't start them reliably.

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.

trojmiejski
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Jan 30, 2019 at 03:04 AM Author: trojmiejski
Cap should be rated for 1600V while the resistor should be 75Ohm. Polish starter should be more or less equivalent to GS-1 starter of the Tungsram S410 parallel ignitor. Those MH lamps called LRJ were made in small quantities, they were primitive, varied in quality and because of that some started without ignitor on the choke alone while some didn't start without ignitor. Most OURJ fixtures probably never had any contact with LRJ lamps and were equiped with MV lamps from the beginning.
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Jan 31, 2019 at 02:12 AM Author: Gospodin horoshiy
trojmiejski

Often this was facilitated by a typical view of electricians of those years, especially of older generations, on the lighting, when the level of awareness did not suggest that there are lanterns or lamps more complicated than LRF.
In Russia in those old years there were also not rare cases when mercury lamps were installed in a new lanterns for sodium lamps. Just because of the fact that the previous generation of old lanterns also worked with these lamps.
Or it could happen after the first replacement of the original lamps, because the mercury lamps was cheaper.
At the same time, they continued to work with the high voltage device, which is why more often than usual they failed.

Nevertheless, these old lamps LRJ400 are found on sale from time to time, which is not the case with LR lamps, especially LR250, which are almost impossible to find. )
trojmiejski
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Jan 31, 2019 at 03:08 AM Author: trojmiejski
Often OURJ doesn't have a starter anymore so the starter circuit is open and doesn't affect the lamp anymore.

Though LRJ are theoretically rare, getting one isn't that very hard if you know where to look. I don't have one myself but I've seen an LRJ lamp owned by someone else in action. That one had a specific violet tint to it.
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Jan 31, 2019 at 03:43 AM Author: Gospodin horoshiy
LRJ sometimes selled on allegro or olx. Not often, but i saw several times as new.
I have this lamp.
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