I'm looking to gift my stepson a headlamp for bike riding. I'm want something that is lightweight, water resistant, micro-usb rechargeable (built-in battery or 18650), wide beam, multiple brightness levels and can withstand an impact. I feel like a wide beam is a necessity since he'll be riding...
My FIL has vision problems and can't see very well, so I had to pull out my MH27UV to help him move around outside this evening. He was surprised by how bright it was. Thinking of getting him one for Christmas
After reading the description of what you're looking for, I think you'll love the Nitecore MH27UV. I own one and everyone I show it to loves it. Awesome light!