Stumble upon two USB headlamp that are much cheaper than the same model with other Chinese branding.
Both available thru prime shipping.

The ECOO is 7.49$ ( ) and pretty much the same as the 15$-20$ Three trees ( ) which I can recommand
Maybe about 150-200 lumens

The WITSS is 7.99$ ( ). This model is normally at around 25-30$.
This one is much more bulky, using two included (unbranded) 18650 button top cells.
Maybe about 700 lumens. It look at least as bright as my Lars rover 650 Lumens, when all the LED are on.

Both are not especially water resistant. Splashing is okay.

Amazon product: LED Headlamp,1200mAh USB Rechargeable Headlights with Motion Detector, 300LM IPX4 Waterproof 8 Mode Lighting, Continuous 30 Hours, Fishing, Camping, Reading, Hiking, Cycling
Customer Reviews:
When I received this, I was surprised how bright it was. Could see clearly and far enough that made walking at night safer and easier. Has a red light function as well so can double as a front or rear bike light. The red light is also bright enough to see in darkness without disturbing anyone . | The band is elastic and adjustable enough that you can get it to fit securely on your head without too much discomfort and it’s fairly lightweight so could wear it all night. Definitely good for the money