Very recently I have aquired an E2DL, L1, L2, and an E2L. All except the L2 have a green tint. Tint variation is normal. All LEDs have some tint, none are really pure white. Of all the LED lights I have owned I could always see a tint to them, even if they appeared very white by themselves you can compare them against other samples you have on a white wall to reveal their "true" tint. ;) The reason some people see some tint more than others depends on your color perception. Everyone precieves color differently. Personally, I like an LED to slightly favor green or maybe yellow. I don't like an LED to favor purple, pink or blue. Those tints really "jump out" at me. Whereas green looks nothing like the angry blue LEDs I remember from the early luxeon days. :)
It is true though that some LEDs more heavily favor one or the other tint. So if yours is horribly green than you can contact Surefire for a replacement.
Also, all of my TIR Surefires seem to be slightly off center. No big deal to me.
+1, when MrGman told me my KX2C head was a bit cooler than his E2DL head, I didn't think much of it. He then said that the other head I sent him was warmer than the first and resembled his E2DL. To ME, the first one was DEFINITELY closer to the "low" end of the color spectrum than the second. This just proves that perception is at work a lot of the time here. MrGman obviously knows what he is talking about, but our eyes see things very differently.