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Clear T17 mercury lamp - hollow cathode effect A closeup shot of the [url=https://trad-lighting.net/gallery/displayimage.php?pid=810]lamp[/url]'s electrode during the run-up phase reveals an interesting effect: the confinement of the (plasma) negative glow within the beehive structure of the electrode, whose geometry results in an enhanced ionization of the gas. This process, called the hollow cathode effect, increases the electron emission capacity of cathodes and thus raises their efficiency. This is a very useful effect that was used primarily in high-voltage sign tubes as well as SOX and many cold-cathode fluorescent lamps. Keywords: Miscellaneous

Clear T17 mercury lamp - hollow cathode effect


A closeup shot of the lamp's electrode during the run-up phase reveals an interesting effect: the confinement of the (plasma) negative glow within the beehive structure of the electrode, whose geometry results in an enhanced ionization of the gas. This process, called the hollow cathode effect, increases the electron emission capacity of cathodes and thus raises their efficiency. This is a very useful effect that was used primarily in high-voltage sign tubes as well as SOX and many cold-cathode fluorescent lamps.
20250425_150509.jpg Philips_T17Cl_c.jpg Philips_T17Cl_b.jpg BC_to_G13_adaptors.jpg Sashalite_Flash_Bulb.jpg
Lamp/Fixture Information
Manufacturer:Philips
Model Reference:T17C
Lamp
Lamp Type:Mercury low pressure
Filament/Radiator Type:Nonthermal discharge in argon and mercury vapor
Base:G13
Shape/Finish:Tubular clear
Physical/Production
Factory Location:Eindhoven, the Netherlands
Fabrication Date:1990s
Application/Use:Plasma diagnostics
File information
Filename:Philips_T17Cl_b.jpg
Album name:Max / Misc lamps and lighting
Keywords:Miscellaneous
Filesize:408 KiB
Date added:Apr 27, 2025
Dimensions:1200 x 857 pixels
Displayed:27 times
URL:https://trad-lighting.net/gallery/displayimage.php?pid=809
Favorites:Add to Favorites

Comment 1 to 6 of 6
Page: 1

Sammi   [Apr 27, 2025 at 06:46 PM]
Ooh, that's lovely.! Love
Max   [Apr 28, 2025 at 07:24 PM]
That's what I like about discharge lamps, the potential to see some really interesting things Smile
Sammi   [Apr 29, 2025 at 05:45 PM]
Indeed, we're just the same... Wonder Mind Blown Love
Max   [May 01, 2025 at 08:22 AM]
And those interesting things are becoming rare too due to the phase out of this particular lamp technology!
Tuopeek   [May 01, 2025 at 08:48 PM]
Interesting image, not see this electrode used with LP mercury before. I've seen similar but slightly larger diameter electrode used in a Philips spectral lamps
Max   [May 01, 2025 at 09:08 PM]
Some of the earliest Philips LL lamps did have the wider beehive electrode indeed, the same type used in the company's SO lamps. Some later spectral lamps then used SOX lamps components, including the present beehive electrode.

Comment 1 to 6 of 6
Page: 1