It's slightly yellowish like incandescent on low, blazing bright white on high.
I also got in the Streamlight Protac HL 600 lumen. Very disappointed. Made in China!!! I'm sticking with Surefire! I try and not to support Chinese manufacturing.
It seems the Surefire has a white but more natural looking high stage light and the Streamlight is a super blinding white that's actually hard to read things with.