Quote:
Originally Posted by shinew
lol...
so yea mercury filled are fluorescent lamp, most of them are really high temp(7k-8k), which gives the effect of making them brighter than they really are by giving out a blueish tint. You can see the effect by just taking picture of something white(wall) without flash, it'll look blueish for most P&S camera with auto white balance... you could also see the effect by going to any local Home Depot store's lightning section, they have demo there that also show how light effect everything looks.
Your older K3 & new K4 screen will look different under the same light if they have different tint caused by whatever(aging is very likely the cause, notice your old photograph tend to look more brownish? could also be something else though...). But even if it's not due to aging, the change itself does not make one superior to another as long as they're within the same spec(eInk did not specify any color temperature under any observer, only reflectance). It just means that under your lighting condition, your K3's screen is a better fit(slightly warmer tint vs the cooler one on K4).
Try them both under one of those light, I'm sure you have access to one somewhere, my guess is that your K3 will probably look more brownish to your liking than the K4 
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Okay I have just given my K4 a tour of my place in every room. In the living room the ceiling light globe is tinting yellow so yes it's a warm light. The bathroom has clear 3 big bulbs on it with no yellow tint.
I can say the green goes away in the bathrooms and the it does look a very light grey compare to living room
but the text is no longer black!
It's dark grey and jagged.
Did the same to the K3. Took it for a stroll the only changes was in the Kitchen with a frosted globe it look yellowish but in the backroom the only real change was text look blacker and better.
Not that I ever use my Kindle in the bathroom but lighting is better for the K3 not so much for K4.