Well, the replacement tubes for my painting lamp didn't fix my lighting problems, though one of them manages to flicker with a very weak light. I'm concluding that it's a problem with the ballast and I can't really be arsed with ordering a new ballast unit and attempting to be an electrician, so have ordered a new lamp and lo and behold, it's out of stock at the moment.
So painting has ground to a halt from the sad trickle it was anyway. I still have my conventional secondary lamps but they don't give optimum conditions. Probably be a month before I get a new lamp. Anyway, all this means is I get more time to spend with my baby girl, which is good.