I built my first red LED penlights back in 1974, We used them for covert stuff and night vision preservation. Wrote an article on it a few years later, and about 5 months after it was published, a couple of small companies were trying to sell them commercially. Don't know if they ever sold any because they wanted like fifty dollars for one.
I doubt that I was the first guy to do this. I imagine that a bunch of electronics geeks independently came up with the idea long before I did, and probably astronomy guys made some too. However, I like to think that I was the guy that introduced the concept to the SpecOps community though.
There is a copy of the article I wrote over on the
Darksbane (Not the forum, but my little flashlight site)
Edited:
Oh Paulr- I missed your post the first time; that was me. I don't remember actually posting it here, but may have, or maybe you ran across it on my site.