Author Topic: Why are /W fluorescent tubes no longer made?  (Read 1645 times)
WorldwideHIDCollectorUSA
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Why are /W fluorescent tubes no longer made? « on: October 25, 2021, 08:58:56 PM » Author: WorldwideHIDCollectorUSA
When browsing through modern North American market lamp catalogs, I have noticed that 3500K /W tubes are not listed in modern catalogs including the fluorescent tube sizes and lengths that were not affected by the 1995 EPACT ban. For example, I see that F20T12/W and F15T8/W fluorescent tubes are no longer made for the North American market. Why were all sizes of 3500K /W tubes got discontinued before the 2000s?
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Medved
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Re: Why are /W fluorescent tubes no longer made? « Reply #1 on: October 26, 2021, 02:07:55 AM » Author: Medved
Not enough demand to justify production?

Could be linked to these tubes sharing the same manufacturing line components (could be even maintaining the phosphor cartridge, used for phosphor coating, with that phosphor type in it) along with the high runner formats which were banned. So it was uneconomical to maintain those production parts just for the few lamp formats that were still allowed to sell.
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marcopete87
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Re: Why are /W fluorescent tubes no longer made? « Reply #2 on: October 29, 2021, 11:58:12 AM » Author: marcopete87
When browsing through modern North American market lamp catalogs, I have noticed that 3500K /W tubes are not listed in modern catalogs including the fluorescent tube sizes and lengths that were not affected by the 1995 EPACT ban. For example, I see that F20T12/W and F15T8/W fluorescent tubes are no longer made for the North American market. Why were all sizes of 3500K /W tubes got discontinued before the 2000s?

Are you sure? (if i read correctly, Jame's website states /W are 3500°K tubes)


https://www.sylvania-lighting.com/product/en-int/products/0000566/
https://www.sylvania-lighting.com/product/en-int/products/0000580/
https://www.lighting.philips.ca/prof/conventional-lamps-and-tubes/fluorescent-lamps-and-starters/tl-d/advantage-t8/927869783603_NA/product
https://www.lighting.philips.com/main/prof/conventional-lamps-and-tubes/fluorescent-lamps-and-starters/tl-d/master-tl-d-super-80/927920083523_EU/product

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WorldwideHIDCollectorUSA
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Re: Why are /W fluorescent tubes no longer made? « Reply #3 on: October 29, 2021, 04:13:27 PM » Author: WorldwideHIDCollectorUSA
Most of those links actually show European market Triphosphor 835 fluorescent tubes and one link shows a North American 835 triphosphor F32T8 tube. The question is in regards to North American 3500K white tubes with a halophosphate formulation, which are pretty rare nowadays such as the F20T12/W tubes. Those tubes had a CRI of 57.
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funkybulb
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Re: Why are /W fluorescent tubes no longer made? « Reply #4 on: October 29, 2021, 09:37:08 PM » Author: funkybulb
 Because whie tubes have lower light quailty in CRI while mass common CW with a CRI of 63 for 4100 K,  so manufacture slowly abandon it manufacture /W lamps.   Heck even find one from 1970s
  Is rare lamp do low production.
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marcopete87
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Re: Why are /W fluorescent tubes no longer made? « Reply #5 on: October 31, 2021, 07:46:34 AM » Author: marcopete87
Most of those links actually show European market Triphosphor 835 fluorescent tubes and one link shows a North American 835 triphosphor F32T8 tube. The question is in regards to North American 3500K white tubes with a halophosphate formulation, which are pretty rare nowadays such as the F20T12/W tubes. Those tubes had a CRI of 57.

Did they still produced halophosphate?  ???

Thank for the explanation about /W, i thought it was only about CCT.
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WorldwideHIDCollectorUSA
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Re: Why are /W fluorescent tubes no longer made? « Reply #6 on: November 10, 2021, 08:21:43 PM » Author: WorldwideHIDCollectorUSA
Actually, many catalogs list /W fluorescent tubes as late as the 1990s.
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WorldwideHIDCollectorUSA
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Re: Why are /W fluorescent tubes no longer made? « Reply #7 on: November 10, 2021, 10:03:36 PM » Author: WorldwideHIDCollectorUSA
I am referencing North American lamp catalogs that listed a portfolio of various different lamps. You can find them on this website:

http://www.lamptech.co.uk/Catalogues.htm
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Desire to collect various light bulbs (especially HID), control gear, and fixtures from around the world.

DISCLAIMER: THE EXPERIMENTS THAT I CONDUCT INVOLVING UNUSUAL LAMP/BALLAST COMBINATIONS SHOULD NOT BE ATTEMPTED UNLESS YOU HAVE THE PROPER KNOWLEDGE. I AM NOT RESPONSIBLE FOR ANY INJURIES.

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