Every guide to changing a flourescent tube light I can find has the same basic two steps: twist, usually 90 degrees, then slip the two pins out through the slot.
With this fitting,I have a fairly major problem with each step here:
- My light fitting has no such slot
- The bulb doesn't twist.
I've confirmed that the bulb isn't stuck (I read somewhere, possibly here though I can't find it again now, that sometimes pins get almost welded to the fitting - but at both ends it's possible to wiggle the bulb about 1mm from the fitting. It's not stuck, there appears to be simply no space for it to twist to.
Here's a couple of pictures of the fitting in question. I can't find any information about this type of fitting.
In this one, I've tried pushing the small rectangular shaped thing at the bottom where the slot would normally be, but it seems to be fixed in place, and even if it was removable, there would be no gap for the pins to fit through in the rim below it:
Here's the other side. Note that the circle that looks like a button in this picture is completely fixed in place, I think it's a vent:
These pictures aren't great (dark for obvious reasons!) - the upside-down-
U shaped outer dim to the holder protrudes about 1cm along the length of the bulb, and the gap in the
U is flush with the end of the bulb before the pins (so therefore doesn't provide a gap the pins could slip out). The dark line separating the holder from the main fitting in the second photo appears to be a small crack, there's nothing like a hinge or detachment here.
Both ends appear to be identical (though the other end is over a fixed fitted cabinet so is hard to see closely or photograph).
To provide a little context, I've quite recently moved into this rented appartment, which is in West Africa and has a few electrical idiosyncrasies including about half the outlets being grounded and half ungrounded, and some sockets being the wrong type of plug for this country (e.g. South African "type M"). This particular fitting looks very old, based on the lack of information I can find online I imagine it's some old fashioned standard which has long been obsolete. No clues as to manufacturer etc that I can see.
All I can think to do is completely disassemble or replace the entire fitting, which I'd rather not do.