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1991 Soviet SLZ LDC F40T12 5000k Fluorescent tube with little use.

1991 Soviet SLZ LDC F40T12 5000k Fluorescent tube with little use.

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This tube I found in my collection. I had it for very long, but never did a presentation of it, because it had no etch. But today I played with my tubes, and I found this tube, and I tried to search for an etch, and I actually found one! It was so faded that I didn't see in in normal circumstances, but today I shined my phone's flash and found that here actually an etch. I tried so many different angles to take a picture of it, but I just can't, it's so faded, that it's impossible to make it look visible in a photo, but it reads this:
СЛЗ
ЛДЦ 40-4
91-III Ц2р20г

This particular Soviet F40T12 was more expensive than usual, because it was a special fluorescent tube, made witch modified phosphor for better light output. It was obvious with tubes were better light output, because you could find a following number after the '40' that indicated wattage. In this case it's 40-4, but I have 40-2 and 40-1. The different number means not that the tube is brighter or not, it means at what year it was experimented. Yes, these tubes were experimental, 'cause they used different compounds in the phosphor for better light output. LB was 40-2, LDC was 40-4 and LD was 40-1, so I guess LEC would be 40-3 and LTBCC would be 40-5 but I might be wrong. This tube indeed has a very good light output for a 1991 tube. It is very bright and has descent CRI at, I would say, 70. I like this tube very much. I actually have two of these, the other one has no etch remnance whatsoever.. The ink on this particular batch of tubes had defective ink, 'cause both tubes are mostly NOS, with very little use, so etches should not be so worn down.

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Light Information

Light Information

Manufacturer:SLZ
Model Reference:LDC 40-4 (experimental, better output phosphor)
Lamp
Lamp Type:Fluorescent
Filament/Radiator Type:Double coiled emitter coated cathode filament
Base:G13 bi-pin
Shape/Finish:Tubular tube
Service Life:approx 30k hours
Electrical
Wattage:40w
Voltage:220v
Current:0.41a
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 with experimental sake

File information

File information

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Filename:IMG_20200405_233411.jpg
Album name:vytautas_lamps / fluorescent tubes T8/T12
Keywords:Lamps
File Size:323 KB
Date added:Apr 05, 2020
Dimensions:2464 x 1776 pixels
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Date Time:2020:04:06 00:12:32
DateTime Original:2020:04:05 23:34:12
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FNumber:f 1.8
Flash:Flash
Focal length:3.5 mm
ISO:88
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Model:BV6000S
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