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1991 SLZ F80T12 LDC 5000k Fluorescent tube, slightly used.

1991 SLZ F80T12 LDC 5000k Fluorescent tube, slightly used.

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This is a slightly used soviet fluorescent tube. In 1991 SLZ started making fluorescent tube with new machinery, that was updated in 1990s, the fact that I found out in old-lighting.ru lighting site. That is why, when you compare a F80T12 from 1987 and F80T12 from 1991 the phosphor formula and application really differs. This tube has a very thin phosphor to optimize light output,. and on top of that, the light produced by this tube is better, because it has higher CRI. The phosphor in this tube has been milled very fine and so it was applied in think layer, so think you could see the cathode on one end really easily. I have several NOS SLZ F36T8 from 1991 and they have the same very thin phosphor. This tube produces a lot of light, and I mean TONS of light. It is much, much brighter than their 1987 counterparts that I have several of. I got this tube from my neighbor. The same guy that gave me the EOLed PZGRL LB F80T12. He found this tube in his garage this morning, and he called me to come and get it. What a nice guy for not throwing it out.

Also., fun fact about soviet fluorescent tube endcaps: Right to about 1967, most f t12 fluorescent tubes endcaps insulators in soviet union were made largely from black glass, the same one, that was used in incandescent edison screw bottom insulator. T8 endecaps were made from makarta. Also, I always thought that fluorescent tube endcap insulators were made from Bakelite, but turns out, they are made from makarta. Interesting.
Overall, nice tube with rare soviet style endcaps with yellow makarta insulator. Nice!

IMG_20200405_235134.jpg IMG_20200405_233411.jpg IMG_20200404_222836.jpg IMG_20200330_150114.jpg

Light Information

Light Information

Manufacturer:SLZ
Model Reference:LDC 80
Lamp
Lamp Type:Fluorescent
Filament/Radiator Type:Double coiled emitter coated cathode filament
Base:G13 bi-pin
Shape/Finish:Tubular tube
Service Life:approx 20k hours (soviet 5 footer 80 watters didn't last very long, it was very common for them to spontaneously destroying the filaments themselves during cold startup, and that lead to the tube rectifying violently, and dying soon after)
Electrical
Wattage:80w
Voltage:260v
Optical
Lumen Output:High
Lumen Efficacy:Moderate
Color Temperature:5000k
Color Rendering Index:Pretty good
Physical/Production
Factory Location:USSR Smolensk
Fabrication Date:1991
Application/Use:For general lighting

File information

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Jovan
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Apr 05, 2020 at 03:31 PM Author: Jovan
PZGRLs biggest wish to happen:
Make good quality tubes.
What is Makarta ?
vytautas_lamps
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My idol is Mylene Farmer, deal with it.


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Apr 06, 2020 at 11:55 AM Author: vytautas_lamps

PZGRLs biggest wish to happen:
Make good quality tubes.
What is Makarta ?

That's a good joke Jovan.
Actually, if you look in ixbt.ru or old-lighting.ru you will see that native Russians always say that Poltava was "the abomination of lighting industry" of USSR. Their fluorescent tubes usually didn't even last for more than 2 months. T8s were usually mercury starved right from the package.
Mercury vapor, sodium street lighting lamps were usually made in poor quality, witch meant that arctubes blackened quiet fast, and the catastrophic failure rate among high pressure lamps from PZGRL factory in general was very high So your joke is quiet adequate in this case

Makarta - is glued very thin strips of resin impregnated wood, porous bakelite or other plastic sheets, or paper together to create an extremely rigid and versatile material for use in high tension and high temperature stress application, like, fluorescent tube endcap terminal insulator or brushed DC motor holder body. It is very resistant to frequent temperature changes and always stays strong. It an also handle very high temperatures and not get soft or start burning, unless exposed to open flame or direct very high heat source

New lighting technologies is a pity fest everywhere you look. From LEDs that last only for two months, to a never-ending global starvation of t8 fluorescent tubes.
We shall reinforce ourselves with good old full mercury t12s and HIDs made to surpass one's life, and give them all the middle finger ;

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Apr 06, 2020 at 02:17 PM Author: Jovan

That's a good joke Jovan.
Actually, if you look in ixbt.ru or old-lighting.ru you will see that native Russians always say that Poltava was "the abomination of lighting industry" of USSR. Their fluorescent tubes usually didn't even last for more than 2 months. T8s were usually mercury starved right from the package.
Mercury vapor, sodium street lighting lamps were usually made in poor quality, witch meant that arctubes blackened quiet fast, and the catastrophic failure rate among high pressure lamps from PZGRL factory in general was very high So your joke is quiet adequate in this case

Makarta - is glued very thin strips of resin impregnated wood, porous bakelite or other plastic sheets, or paper together to create an extremely rigid and versatile material for use in high tension and high temperature stress application, like, fluorescent tube endcap terminal insulator or brushed DC motor holder body. It is very resistant to frequent temperature changes and always stays strong. It an also handle very high temperatures and not get soft or start burning, unless exposed to open flame or direct very high heat source

Thanks for reply.Have you ever seen PZGRL tube or bulb which lasted quite a long ?I think I saw PZGRL tube near me made for Soviet market from 1982 in working condition.Why T8 tubes were mercury starved ?
vytautas_lamps
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Apr 07, 2020 at 12:08 AM Author: vytautas_lamps

Thanks for reply.Have you ever seen PZGRL tube or bulb which lasted quite a long ?I think I saw PZGRL tube near me made for Soviet market from 1982 in working condition.Why T8 tubes were mercury starved ?

The only PZGRL tube that lasted a pretty long time was a LB-80 F80T12 tube, that lasted for almost 4 years. It was used pretty much every day for extended periods of time, so it lasted a pretty good life time.
T8 tubes were mercury starved, 'cause they were made with very thick phosphor layer, witch absorbed mercury very easily.

New lighting technologies is a pity fest everywhere you look. From LEDs that last only for two months, to a never-ending global starvation of t8 fluorescent tubes.
We shall reinforce ourselves with good old full mercury t12s and HIDs made to surpass one's life, and give them all the middle finger ;

Jovan
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Apr 07, 2020 at 04:02 AM Author: Jovan

The only PZGRL tube that lasted a pretty long time was a LB-80 F80T12 tube, that lasted for almost 4 years. It was used pretty much every day for extended periods of time, so it lasted a pretty good life time.
T8 tubes were mercury starved, 'cause they were made with very thick phosphor layer, witch absorbed mercury very easily.

Thanks for info.Quite a rubbish tubes.
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