I've used a 6V operator before. Incandescent version with 2 CR123a batteries. It has a very usable clip(detachable). Adjustable focus head and is very similar in size with a SF E2e light. It could fit 17670 protected cells and the clickie switch is forward. The tailcap is integrated with body. Uses bi-pin lamps. I'm sure you could try to get some other bulbs, like the Strion with 1x17670 for rechargeable option.
It was a nice size but didn't offer anything better then my E2e back then.
There is also a LuxV LED option for this light, haven't tried it out. LD makes good quality stuff, but today's LEDs are just better.