Clip as in, on to a rod, tent flap or board edge, a decent size not the tiny type that clips onto a book
Light must be adjustable, ideally both brightness and beam spread
I definitely want portable, compact, maybe folding designed for camping
Must be battery powered, either rechargeable, ideally USB-C yes I realize this can reduce longevity, so a replaceable lithium would be ideal
or if they take AA / AAA, that would let me use XTAR type rechargeable cells
Finally I prefer a dark colored body, ideally blue or green