copied from the arc flashlight faq:
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Versions
0.9 - First shipped in December of 2001. voltage regulated, 3-packs,
1.0 - First shipped in February of 2002. Switched to NX05 optics
400 Hybrid – Bridge between version 1 and version 2. Had new circuit of version 2 in housing of version 1. Circuit set for 330mA (mistakenly reported as 400mA)
500 hybrid – Same as 400 but circuit is set for ~400mA (mistakenly reported as 500mA)
2.0 New current regulated circuit design, thermal circuit breaker, higher output. Waterproof, slimmer design, lexan protected optics, new 1pc head design
2.1 Flex washer (fixes flex failure)
In late 2002, we changed the battery packs from the twist design to the TSP (Tail Switch Pack) design.
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