> Is it an electronic ballast or a conventional one?
>
> Electronic, I think. =A0I didn't take a note of what was printed on the m= odule
> casing, but it was certainly made by MK.
>
> > > Is there a starter switch (small cylinder with two pins usually
> > replaceable from outside)/ does it hum slightly when on?
>
> No, and no.
>
> > ...a variety of potential failure scenarios.
>
> The most urgent question in my mind is "is it safe to use the light as it
> stands?". =A0Even if it is safe, if there's likely to be another general
> failure then I'll replace the whole thing.
>
> Thanks for your response.
>
> Bert
The fault could be anywhere. Its pointless asking us to take guesses, you'd have to troubleshoot it.
Is it safe? No. Faults like this are a fire risk. Fl fittings are so cheap I'd just replace it.
NT