I have just found this project here in project development (so busy lately!) and I would like to say that the schematic itself looks nice, visually. I did not know that you can make an Altium schematic so good looking. :P
Anyways, how did you find such a high bandwidth led? I remember a few months back looking at LED data transmission using cheap off the shelf leds, but couldn't find anything that listed possible bandwidth of 1 Mhz or up. Also, I am confused as to how you are not killing the leds with so much current, even though the duration is only 83 ns. Did you get any dead leds? Also, any pictures, they are always welcome in threads! :)
And lastly, I did not see the original posts so I do not see the arguments made, but I would really like to chime in on this. While the legality of operating such a device on a vehicle is questionable in (I assume) many countries, the OP did not say he/she was going to use it on a vehicle. Maybe it was done out of curiosity, to see if such an implementation would work, which in turn could mean that it was meant to advance the OP's knowledge on the matter, and knowledge alone should never be impeded because of someones opinion on said knowledge. This project was not doing any harm to anyone, other than hurting the feelings of others through offense, so I don't see why it would have been needed to take it down. Just because information goes against your opinion or beliefs, does not mean the information should be blocked. Not to mention that if a police radar gun can be defeated so easily, then the guns were very poorly designed or planned out, showing a need to get a much more "secure" and "proper" means of measuring speed. After all, security through obscurity has never worked, is not working now, and never will work.
Thank you Ian for keeping such a project up, it is probably one of the many reasons this site is held in high regards among many hobbyists everywhere.