Can’t remember on the T10. It hasn’t got any blinkies and is an XP-G2. But I can’t recall if anything was done specifically or if it was just a discounted price with the BLF moniker added.
The other light you refer too was one designed by the forum members and a member (now Reylight I think) arrange manufacture. It was know as the BLF Ti at the time and is an 18500/18650 custom titanium light with tritium in the head and tailcap.
It was supplied as a host for members to fit their own driver/LED combo.
Was a pretty cool project and quite sensible money.
Here is one thread on it: BLF Ti - post your pics and specs
There was a project/build thread, but I can’t seem to find it at the moment.