Yes, your eyes are very sensitive to cyan, but that's not really a good thing. The cyan Luxeons have a median wavelength of 505nm; the peak absorption wavelength for rhodopsin is 498. Cyan light will destroy rhodopsin rapidly, completely crippling your night vision. And since it takes about 30 minutes to replenish, you're completely out of the game if the light goes out. You'll actually get a few more lumens out of a green LuxI, and it will do far less damage to your night vision. Red-orange might be the best. At 617nm, it's effect on rhodopsin is negligible, and it's more visible than red (in addition to putting out more lumens at the same power).
I'll bet that guy really makes enemies quick, blinding all the other cyclists and killing their night vision.