Thinking more about it, although the light on the Kindle does look a little nicer, I reckon the blue tinge to the Glo light is a bit of a red-herring.
1. Unless you are very sensitive to the light you probably won't even notice it in normal use, and would probably only see it if comparing the Glo and the PW side by side.
2. It's most noticeable with the light at it's brightest, in a darkened room. You will never have your light at anywhere near the brightest setting in a dark room, as it's only bright when you are in a well-lit room.