I have just bought a Ludicrous Lumens add on. Used it a couple of days ago with an Ultima T38 IR torch. Very impressed, a friend with a Yukon Photon is thinking of getting rid in favour of the ludicrous Lumens.
Have issues with reflections from the mod, so will need to move the IR source. but good for a couple of hundred yards, and very clear - with an MTC Mamba Lite scope.