scuba, pic was originally posted by barbarin showing barbolight U-09 in action by cave divers somewhere in Spain.
U-09 is designed ground up for max reliability. tri-lux is wired in parallel. so in unlikely chance one luxeon goes dead, other two luxeon will stay lit to get you home. (all electronics can and do fail)
it's direct drive light that's regulated by careful selection of components. VIN is mated to VF of luxeon to limit current. NMH C cells is used due to cost, safety, capacity, flat discharge and performance in cold temps, etc.
Has one of best heatsink designs I've seen from ANY light. built like a tank! designed to be operated with gloves, very tactical grippy surface.
I've had the lens out and it's amazingly thick. Orings seals from top and side. most bomb-proof light I'm aware of.
main disadvantge is cost (aprox. $300) and availability. aprox. 10 lights have made it to US so far.
here's pic of internals: note solid copper heatsink