aznsx
Flashlight Enthusiast
I'm curious, so I'll try to chase that patent down some time to see if it might explain the lack of lights with that DF setup in the market. It is odd.
Just to follow up on my own question posed regarding the unique nature of the Streamlight ProTac 1L-1AA's 'dual fuel' feature and possible reason(s) why other manufacturers haven't (for the most part) adopted a similar design:
After scanning through this patent doc, it appears that that it pretty well covers those related design aspects and thus likely answers the question.
Patent Public Search | USPTO
patft.uspto.gov