Brompton owners

you can, but plenty of others have done the same.
I asked @sbbohr on here for advice/info, but I've got an SP sv-8 dynamo hub (think I brought it S/hand off here, but even new it's still £80 cheaper than a Son XS,
https://www.starbike.com/en/son-xs-dynamo-hub/?country=GB&currency=GBP&keep_params&gad_source=1&gclid=Cj0KCQjw_qexBhCoARIsAFgBleuIdWl8PVKqSNG-W4g1k1jJpZkROfs2003JibsiRp7oEVgwxq5X-vMaAjnBEALw_wcB#50143
which I really wanted, and am using an old Supernova E2 front light, the versions before this one
https://www.merlincycles.com/supernova-e3-pro-2-dynamo-e-bike-front-light-241784.html?utm_source=PHG&source=PHG&utm_medium=Affiliates&utm_campaign=genieshopping
and this rear light
https://www.sjscycles.co.uk/lighting/schmidt-rear-light-rack-mount-50mm-black-clear/
built the front wheel myself, had my LBS do the truing. Had lights and cables sorted when LBS replaced my rear triangle.
Only issue with getting a Supernova front is that you have to use it with a supernova rear, so you get a standlight I think.
If I didn't already have a supernova I'd have gone with a son edelux,
https://www.condorcycles.com/products/schmidt-edelux-ii-high-power-led-headlight?gad_source=1&gclid=Cj0KCQjw_qexBhCoARIsAFgBleuX26lGKVAnQedNd1o2LhH5RGQeULCgHZ7XJSb9aXKVC5VhpWowYJsaAiSbEALw_wcB&siteid=1630430&source=webgains&variant=37796597694614&wgc=1630430&wgp=281345
because they look lovely, and are small enough to fit under the luggage block.
All of those options are slightly pricey, but you could do an IQ-X or IQ-XS as a front and any B&M rear light, and they'd work just as well.