Hi

I fitted a flourescent light fitting just over a year ago in the kitchen,
which worked fine, but has recently begun to start off fairly dim, before
brightening up over the course of a few minutes, although to nowhere near as
bright as it used to be.

It's got a circular 60w tube (360w equivalent apparently - it was very
bright when I fitted it) which costs about 12GBP to replace. Before I get a
new one, can anyone tell me whether these symptoms sound like it's the tube
or the electronic ballast that's dying?

Cheers

Jason