"N_Cook" wrote in message
...
any opto-isolators with hold-off/control function?




Nope, no optos. It does have a hold-off in that there is a separate little
supply in the fixture that powers the electronics and lamp-house fan. The
fan supply also drives a relay on the faulty board. This relay is in series
with the mains. I'm assuming that it prevents the lamp from coming on,
unless the fan supply is established - not that this would help of course,
if the fan itself had failed ... :-)

The relay is coming on, so this 'feature' is not associated with the current
problem.

Arfa