If you go with the 9mm diode you will need the lens barrel DTR also sells then you could use that sweet lens that comes with the diode.
Yeah thanks but I went with the M140 for my first build. Figured I would make things simple getting it with the driver already installed. Also ended up going with DTRs $39 black host. Looks more like a flashlight, its all black, and it has a clip and string. Thanks.