In My Opinion, the problem with the EYE10 XMLU2 is it has a very green tint.
Eagletac XMLU2 is known to be a premium pure white tint.
Modding the EYE10 with a nicely tinted XML2U2 would make it quite nice then.
I've moved on to 18650 lights for now though.
I've heard a few others complain about the EYE10's green tint as well, although I was lucky I guess in that mine only exhibits a slight greenish tint (output shifting) that so many XM-L's seem to have. Even my new nailbender P60 XM-L2 5000k neutral drop-in has a very slight green tint, and in both cases the undesirable tint is so slight, it just doesn't bother me.
And yes, out of the 3 D-series XM-L U2 based EagleTac lights I have, they are all the same consistant premium white (probably 5800/6000K range). IMO, ET has some of the most consistant tints in a given bin of any production manufacturer that I have personally tried!
On the other hand, every Foursevens and Olight I have owned have had tints so blatantly green I sold most of them at a loss (and I really like Foursevens UI's, sizes, and outputs). I've had 5 Foursevens lights and
all were so green it almost seemed intentional?!
*Apologies for straying so far from the OPs thread topic