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It's like a large version of a neon pilot light.
The base of these bulbs becomes warm, so they probably have a
current-limiting resistor in the base.
3. there is no discharge 'ray' between the orange electrodes at their
point of least (4 mm)separation.
I think that a "ray" would exist if you could remove the series resistor
and crank up the current to a very high level. But I'm not sure.