Mine has a green tint too. Of course, it's a lot more obvious when you compare it to other LED lights, which all of mine are of the bluish, purplish tint.
My first LED light was from Reintec(sp?), the mag light drop-in, and it was terribly green. (I requested for an exchange but was ignored, so ain't buying nothing from them again.) My second one was the CMG Reactor III. Not having any other LED lights to compare, I thought it was the whitest light, especially compare to the yellow Maglite. Of course, since then, I have many more lights to compare with, and yes, my LSHFP has a green tint compare to my other Arc LS lights.
I think it's a matter of personal preferance. I don't need my light to be pure white, but greenish tint is probably on the bottom of my list of acceptable lights...
Charles