Oooh, good catch Lithium, I said I kept going back to add details, but Arc is really relevant to the HDS story.
Between the solo project of the Action Light and the first EDC series, Henry had teamed up with Peter Gransee, owner of Arc Flashlight, LLC in 2001. While the greatest volume of Arc's were the later AAA twisty lights, the project that existed only because of Henry's presence, was the LS series, and finally the Arc4/Arc4+ before Arc folded (for the first time) in 2004. Peter resurrected the company as MTD LLC, and focused on the fixed level, AAA keychain lights, and only went out of business earlier this year (2016). But back to Henry - he invented the first programmable LED flashlight in the Arc LS (Luxeon Star, the state of the art LED back then). So while the current generation lights represent an evolution that resolves (mostly brutal durability) shortcomings of the original EDC's and Novatac lights, the original Basic/Ultimate EDC was likewise a massive upgrade (more functional and reliability than just durability) from the Arc series.
I updated the above manifesto with the Henry-centric portion of this important step in the birth of the HDS flashlight.