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Philips TL 20W/25

Philips TL 20W/25

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I bought over 20 fluorescent lamps for less than 25 €. These tube is unused (NOS). It was made fir the German market

( WEISS U = Universal white)

What does the "B" in the square exactly mean?

IMG_20190702_215458.jpg IMG_20190702_202650.jpg IMG_20190702_201313.jpg IMG_20190702_181618.jpg

Light Information

Light Information

Manufacturer:Philips
Model Reference:TL 20W/25
Lamp
Lamp Type:Fluorescent lamp
Filament/Radiator Type:Shielded cathodes
Base:G13
Shape/Finish:T12 coated
Service Life:7500h
Electrical
Wattage:20W
Voltage:60V
Current:0,35 A
Optical
Lumen Output: 1000 lm
Lumen Efficacy:50lm/W
Color Temperature:4200k white universal
Color Rendering Index:>70
Physical/Production
Dimensions:38mm x 600mm
Factory Location:Bath, New Hampshire
Fabrication Date:December 1970
Application/Use:Industrial lighting, traffic lighting , office lighting

File information

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Album name:The Lightman / Fluorescent Lamps
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Date added:Jul 02, 2019
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Date Time:2019:07:02 20:13:13
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James
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Jul 02, 2019 at 03:42 PM Author: James
I believe the B refers to an old German industrial standard that defined the colour temperature and colour rendering index of fluorescent lamps. It was used during the 1970s-80s on various Philips, Sylvania and Thorn tubes destined for the German market, but strangely I have not come across it on Osram lamps.
The Lightman
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Jul 03, 2019 at 12:46 PM Author: The Lightman
My Atlas and Astra tubes have these letters too. They were made for the German market. I think, I found so many of them, because I life in Germany and it's simple to get them here.
Proteus
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Jul 06, 2019 at 05:41 AM Author: Proteus
This letter is a riddle which some of us already have made acquaintance. I have seen it as well on a lot of tubes, especially Sylvania. I hope, soon there will be time to bring a bit clarity there...

Very interesting: In Germany, there are really al lot of Philips /25 tubes installed. In Switzerland, we don't seem them at all. But we used a lot of Osram's color 25 instead of Philips, I don't know why.
Philips tubes are almost always in uglier color /33 here.
TL buis
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Jul 07, 2019 at 01:30 AM Author: TL buis
Yep Proteus, Germany used a lot of /25, Holland and other countries /33 and UK used /35??
monkeyface
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Jul 07, 2019 at 01:42 AM Author: monkeyface
Yes Philips colour 25 was somehow very uncommon in our country while Osram colour 25 was quite familiar.
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