so, I've been scouring through old threads on the F30 forums looking for a respectable halogen low beam replacements and it seems there aren't many options. Some say they replaced with LEDs and the light output is equal to halogen, but others say LEDs put out less. Then, some of the replacement halogens I looked up seem to have poor lifespans and/or put out less light than OE halogens.
I did stumble across a thread where someone recommended these.
https://store.candlepower.com/osraulhiouh7.html
a 55W halogen.