the one and only test is to put a known good test bulb on it...anything
from a scanner or other lcd ... be sure to note insulation where you
make the connection since 1kv will arc if not good...and then oh oh

i am asking now...anyone...do the bulbs have polarity...i did just look
at the electrodes from a dead one (crunched off the glass) and they were
different...one was hollow ... the other looked solid and noticabely
burned at the tip ... one of the several bulbs I have seen had a
marking on one end ..C1 or it might have been C2