When you were doing your research, you probably came across both penlights and tactical lights. The term "penlight" refers to the shape of the torch. And there are plenty of tactical penlights. Most tactical lights have a lot of power output, as well as a strobing feature to disorient subjects in the field. There are also many non-tactical penlights that do not have strobing features and have less power. These are more suitable to use by mechanics, carpenters, electricians, and medical professionals. There is a bit of an overlap and both make exceptionally reliable light sources.