Why did North American 32w and 40w circline lamps switch from T10 to T9 tubing? « on: January 21, 2023, 02:18:47 PM » Author: WorldwideHIDCollectorUSA
When I looked at older North American lighting catalogs, I have noticed that the 32w and 40w circline fluorescent lamps used to have T10 tubing, but in newer catalogs, I noticed that the 32w and 40w circline fluorescent lamps have T9 tubing instead just like the 22w and 20w circline lamps did. Why did North American manufacturers decrease the tubing diameter of 32w and 40w circline fluorescent lamps?
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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.

	Re: Why did North American 32w and 40w circline lamps switch from T10 to T9 tubing? « Reply #1 on: January 22, 2023, 06:02:14 AM » Author: Medved
My guess: Streamline the production (common tooling, socket parts that need to wrap around the tube, fixture components like clamps to hold the lamp in place,...), when the technical benefit of different cross section for a different rating is small. But just a guess...
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	Re: Why did North American 32w and 40w circline lamps switch from T10 to T9 tubing? « Reply #3 on: January 28, 2023, 11:58:18 AM » Author: WorldwideHIDCollectorUSA
Never knew that European 32w and 40w Philips circline lamps also changed tubing diameter from T10 to T9. I also wonder if Osram also did the same with their 32w and 40w circline lamps as well.
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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.

	Re: Why did North American 32w and 40w circline lamps switch from T10 to T9 tubing? « Reply #4 on: January 28, 2023, 12:23:34 PM » Author: Alex
Hello Osram and circline lamps, I dont even know if Osram ever made T10 fluorescent tubes. I have german Osram circling tubes from the mid and late 80s. They are T9 My tube from the late 70s was made in the US by sylvania. I known in east germany they used T10 glass (likely until 1990). However these circling tubes are a novel shadow free design which is a very different to the design used in the rest of the world. best regards, Alex
« Last Edit: January 28, 2023, 12:27:53 PM by Alex »		Logged

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	Re: Why did North American 32w and 40w circline lamps switch from T10 to T9 tubing? « Reply #7 on: January 29, 2023, 03:45:46 AM » Author: WorldwideHIDCollectorUSA
Quote from: Alex on January 28, 2023, 12:23:34 PM Hello Osram and circline lamps, I dont even know if Osram ever made T10 fluorescent tubes. I have german Osram circling tubes from the mid and late 80s. They are T9 My tube from the late 70s was made in the US by sylvania. I known in east germany they used T10 glass (likely until 1990). However these circling tubes are a novel shadow free design which is a very different to the design used in the rest of the world. best regards, Alex As far as I am aware, Osram actually did make some T10 linear fluorescent tubes for the Brazilian and Mexican markets. The link shown below features several listings of Brazilian Osram T10 linear fluorescent tubes: https://lista.mercadolivre.com.br/fluorescente-osram-t10#D%5BA:fluorescente%20osram%20t10%5D In some cases, the Brazilian Osram T10 linear fluorescent tubes were even sold in other Latin American countries such as Venezuela: https://articulo.mercadolibre.com.ve/MLV-731510514-fluorescente-f40-watt-t10-osram-oferta-_JM#position=4&search_layout=stack&type=item&tracking_id=2b85d7c6-763c-4a9a-a2ce-b8d70b422c1c
« Last Edit: January 29, 2023, 03:53:23 AM by WorldwideHIDCollectorUSA »		Logged

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.