"NSM" wrote in message news:_Wmzd.9650$Y72.7767@edtnps91...

"Jerry G." wrote in message
...
| Most of the time this is a sign of the lamp failing. Sometimes it is
also
| the ballast transformer as well. You will have to try the lamp first. If
the
| lamp is still flickering, then change the ballast transformer.

Change the ignitor first. It's easier and cheaper than changing the
ballast
transformer. That you should be able to test by shorting it with an AC
ammeter with the ignitor removed.

N



This is a mercury lamp, they don't use igniters. Only HPS, modern
pulse-start metal halide and some modern LPS lights use an igniter. Mercury
vapor lamps are all probe-start and rely only on sufficient open circuit
voltage from the ballast.

Also his lamp is igniting so even if it did use an igniter that's not the
problem, if the igniter fails in a pulse-start fixture the lamp will never
light.