Sconce.
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While technically correct, sconces seem to generally refer to indoor lighting.
I know what you mean and have an old light which does that, which was on the house when I moved in.
After frustratingly searching, I believe the terms you're looking for are dual light level PIR, hi-lo PIR, high low PIR.
Here's a product that has the feature although it may not be cosmetically to your taste https://www.universal-lighting.co.uk/products/dual-light-level-led-outdoor-pir-wall-half-lantern-white/ Here's another https://www.universal-lighting.co.uk/products/dual-light-level-led-dusk-dawn-white-outdoor-pir-wall-light-wide/
No affiliation to them just they came up when searching and had two products that matched. Good luck with your hunt, they are out there!
Awesome, cheers I'll check these ones out.
I should probably give an example.
Something like this but I dont think it turns on dimmed mode at night, it just enables whether the motion sensor works.
https://www.screwfix.com/p/saxby-oslo-outdoor-wall-light-with-pir-sensor-grey/644re