I got a XM-L2 U2 1A de-domed, on the original copper star though (removed the kapton tape, used AS5), and did the resistor mod published here, and got 347 kcd measured at 4.3 meters though -- still, that's 1178 meters, though the 347 may be low.
If you de-domed the stock LED, figure double or a little better the stock # of 125-135 kcd, so 270-280 kcd, or so, you are probably getting.