The Haikelite MT-01 is a 3x18650 general-purpose light the size of a Red Bull can. Its large battery capacity and stable output make it a good choice for extended use. It also provides the option of using fewer 18650s if necessary.

The Klarus G30 is a light for extended use. Its 900 lumen mode lasts 3.5 hours with no change in brightness over time. It's predictable, reliable, and better for getting work done than showing off. I don't care for the user interface with long-press for off and a high chance of accidental strobe, but this is a light meant to be turned on and left on for a long time, making the UI less of a concern than on an EDC light.