The one thing that I’m curious to find out is if the Vinh modded TK75 will beat or at least equal a stock RC40. The RC40 will probably have the wider flood. But as far as comparing lumen output and throw, it should be interesting. I personally would enjoy having the modded TK75 over the RC40 because of the flexibility. You could go portable or add extensions for longer runtime. I also prefer using widely available 18650 batteries over a proprietary cell. The FF4 will spank the RC40 in throw and lumens (better tint too) but the flood isn’t as wide. If you wish to stick to LED’s, you could get a BTU Shocker as people suggested and send it to Tom E. to amp up and de-dome. He reported that one of his latest de-dome mod had 467k in throw (in the same ballpark as a FF4) and 4100 lumens. I'm shocked by this Shocker... (de-domed now, more info)
467k in throw is nuts for a multi-emitter light. I’m rooting for you in your contest. Give us a report on your next challenge.