You are one forum away from the one that specializes in bike lights
https://www.bikeforums.net/electroni...hting-gadgets/. However most of the people there are into using standard $$$ bike lights.
Although I have a couple of different bike lights, the flashlight is my favorite for just clipping in and going for a ride. I use a standard XML-T6 LED flashlight that uses a single 18650 Li-ion battery. The output on high is 950 lumens. It will run for many hours on a single Panasonic 3,400 mAh battery, one of the best batteries available. If you couple it with the 360 degree flashlight mount shown below it can be focused and aimed anywhere you want the beam to be. The flashlights are sub $10 on eBay. The mount costs a dollar from overseas vendors or you can get a pair of them for $4 from a US vendor on eBay. Panasonic batteries are under $14 for a pair of them. You will need a Li-ion battery charger if you don't already own one. The flashlight holder was designed specifically for this type of light and will keep the flashlight secure on even the bumpiest rides. Spring for the Panasonic batteries as the run time will be multiples of that for the Chinese batteries (Trustfire or Ultrafire).
Ultrafire flashlight (real output is ~950 lumens, cheap battery is probably 800 mAh but it will let you see how the light works.
Flashlight with cheap battery, flashlight holder, and cheap charger $7.05
https://www.ebay.com/itm/Ultrafire-8...IAAOSw92Ra-bwg
Flashlight holder
$4 for a pair – US seller
https://www.ebay.com/itm/NEW-360-Deg...kAAOSw8iZc0km7
$.99 postpaid from China
https://www.ebay.com/itm/360-Degree-...MAAOSw8gVX~Iws
Panasonic/NCR 18650 battery - pair postpaid $13.99
https://www.ebay.com/itm/Brand-New-2...ss!89108!US!-1