The phrase “strobe lights” means something different to photographers than it does DJs or haunted house curators. Good light is as crucial a tool to photography as a nice lens and a solid camera body.

This strobe light, which measures about 19 inches long, is the most powerful option among our picks. It’s built with 800-watt lights that can be dimmed from 0 to 100 percent, and it can fill a large ...