Cold Cathode generally ment a tube for room lighting.
Backfilled with Argon/Mercury and using a cool white phosphor.
The intent was to have a very long life tube for places you cannot
easily service such as department stores, malls, cove lighting, or high bay
work spaces. Also had the advantage that the local neon sign shop
could easily produce room lighting including custom shapes.
For the mass produced CC lamps, a special socket was used at each end with a built
in safety switch to terminate the HV if the lamp was removed or the tube broke.
This switch placed considerable mechanical pressure on the tube, which is ok because
glass is incredibly strong in compression.
The lamps I remember were 8 foot long. A properly constructed cold
cathode tube could achieve much,much longer lifetime over a classical
flourescent lamp with hot cathodes. On the order of 5 to 10 years.
A neon sign tube in the US is designed for typically a 20 mA or 30 mA
constant current HV transformer. CC lighting ran at much higher currents.
However the install cost was high compared to a hot cathode rapid start lamp.
CCFL in modern terminology are usually very small tubes with a tiny diameter used for back lighting
LCDs.
I have not seen a working room sized cold cathode lighting install in over twenty years.
Edit, I did. I did taw a CC install, today when I went to vote.
The new elementary school has them in the Gym.
W. McFarlane-Moore developed some of the first large scale room lighting using the fact that
carbon dioxide emits a beautiful pale bluish white light without a phosphor.
Moore tubes needed a fill system as the CO2 broke down over time.
See:
https://signsofthetimes.com/cold-cathode-hints-part-i/https://www.lighting-gallery.net/gallery/displayimage.php?album=2496&pos=42&pid=82794Your common NE2 indicator lamp is also cold cathode, not having a heater to cause enhanced emission of electrons.
Steve