- Joined
- May 26, 1999
- Messages
- 1,964
Planterz said:What's the connection between HDS and Arc? The descriptions say stuff like "Improvements over the Arc4..."
Heh… that’s sort of a mild “can-o-worms” type question.

Basically, Arc (run by Peter Gransee) had the AAA and the LS series of flashlights. They brought in Henry from HDS to help engineer the Arc4, which was really light years beyond previous Arc designs. At that time, HDS was a little known company that had only produced one headlamp model.
There was a big (and public) falling out between Henry and Peter, with each claiming that they weren’t given enough credit for the Arc4 design. Henry announced that his company (HDS) would start making an improved version of the Arc4. At the same time, Peter announced plans for the Arc5.
Early versions of the Arc4 frequently had unreliable and/or stiff switches. Also, you couldn’t stand the flashlight on its switch end. The HDS EDC lights corrected these problems. Plus, the HDS lights use a Luxeon III (versus the 1-watt Luxeon LED on the Arc4), have more features in the software (with the Ultimate), and are more efficient.
The Arc5 was supposed to have similar improvements, but Arc went out of business before it went into production. (There were probably a few prototypes made though.)
Although the HDS Ultimate is really just version 2.0 of the Arc4, I think it is a much better flashlight. The HDS has more light levels to choose from and can get both dimmer and brighter than the Arc4. The HDS is also more ergonomic and its switch is definitely superior to Arc4’s.