Looks like a 45W Compact Fluorescent Lamp (CFL) which will be about 2800 lumens. You want half that, probably in some sort of LED.
https://www.screwfix.com/p/sylvania-toledo-bc-gls-led-light-bulb-1521lm-13w-4-pack/888pp maybe.
Ok, thanks mo, jelly and aggi. I ordered a screwfix bulb, I'll see.
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Looks like a 45W Compact Fluorescent Lamp (CFL) which will be about 2800 lumens. You want half that, probably in some sort of LED.
https://www.screwfix.com/p/sylvania-toledo-bc-gls-led-light-bulb-1521lm-13w-4-pack/888pp maybe.