the photo of the energized lamp shows orange neon-like colour so probably neon gas content includes some argon which generates UV to activate the phosphor coating. I purchased a large number of similar bulbs with 2 inch leads from the former Active Surplus in Toronto. Electronic Goldmine also used to have them.
Cheers Pharma Phil
---------- Original Message ----------
From: gregebert <[email protected]>
Date: April 2, 2020 at 2:37 PM
I've bought similar bulbs, with leads. Several years ago I bought a box of 1000 green "NE-2" from China, and sold a few batches to neo-nixie members.
It's hard to tell what the internal gas is, but when it ionizes it also causes the phosphor coating of the bulb's interior to glow. The nice thing is that the glowing area is the entire interior surface of the bulb, and not just the negative electrode in a conventional neon bulb. When off, the bulb appears white. Other colors such as blue, red, yellow, and white are available.
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