You would be better off if you turn the mains off, and change that to a normal pendant lamp holder, then turn the mains back on, insert "normal lamp" and turn it on.
The "thing" you have is a ballast for a 4 pin, 2D lamp. You may find that if you get a new lamp it does not work as the ballast has failed (Not unusual) I am not saying it has failed, just that without a new lamp you will never know, but 2D lamps were never popular. (They are not the nicest looking lamp either.)
They are not 2D they are GSP01 but the problem is can be 10 to 26 watt and data sheet says 64 to 110 volt depending on size, so I would assume there is some sort of ballast to drive them.
In the main you need a ballast to match the lamp, there are some electronic ballasts that will work a range of lamps, the lamp was very short lived, you can still get the bulbs, but I have never come across them, know they exist, but the compact fluorescent with everything built in came out and the lamp you show went out, but here is advert for 18 watt version https://www.any-lamp.co.uk/osram-dulux- ... zkQAvD_BwE
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