Wish I could find that thread for you. As other people have said, even with fancy optics, it is not possible to collimate an LED because the light is not coherent like laser light. One person estimated that even with the best of optics and an extremely fancy set up, the light would not be coherent and the divergence would be at least 10 times that of a laser.
By the way, what laser is that in your avatar? It looks really cool.
I've done it, but it doesn't work nearly as well as a laser.
The lens had an 8 inch focal point and was positioned about 6 inches from the LED.
The result was a 2 inch diameter dot at 25 feet, and with less than 50% of the total output of the LED.
It works, but not well.
There is no way to get a beam from a LED that can match or even come close to a laser's.