[EE] NE2 ignition voltage in an electric field

Is there any way to figure the electric field strength that would light an
NE2 lamp?

I realize this is a sort of 20% tolerance question, but I'm curious.
The nominal ignition voltage is something like 55V when powered
conventionally.

I've seen a neon light up with its leads shorted in the presence of a
relatively large electric field, so I'm wondering if this can be used to
figure the E field strength at that point.