Edit
Lights have become daft bright, much cheaper, and with a lot less focus on the beam pattern
(Note to self) – stoprushingandmuktitasking 😛)
The best option is two traditional lights, one on strobe, one on constant
What’s a ‘traditional light’ is re bicycle lights? All the ones I remember are either the bright ones with a round beam or the mad-bright ones with a round beam. Even the expensive ones (bar a very select two or three designed expressly with a cutoff beam like a motorcycle light) are all much the same.
Going decades back I do remember Pifco and Ever Ready battery lights, rectangular in shape and threw a dim yellow beam into the gloom! The ‘beam pattern’ was an amorphou thing with a brighter ring around it, iirc!