The Acebeam PT20 is a pen light with high output and a selection of materials and finishes. It runs on an included, USB-chargeable 10880 Li-ion battery, or two AAA batteries with reduced performance. Its claimed output of 500 lumens, which my testing suggests it exceeds makes it one of the top performing lights in its category. Output on Li-ion is not perfectly regulated, but stays impressively high.
1 Thank