Thread: Kobo is developing a 7.8 eReader
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Old 08-28-2016, 11:21 AM   #538
John F
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Join Date: Feb 2009
Device: Kobo Clara 2E
Quote:
Originally Posted by Nick_1964 View Post
I put it between spoiler tags as it is, in my opinion,far beside the goal of this thead and also about a small point of my "list" why i would skip this reader and I don't want to bother other readers of this thread.

Spoiler:


All kinds of leds have "unwanted" lights, lets call it, radiation ?
I don't know the right words for it, but they have a spectrum depending on the light and the way it is used to "diffuse" the light over the screen to be equally lighted.
If that was not been done, the screen would be lighted very bright in the lowest part of the screen, and the more higher it will be fainted..not so bright.
There is a special layer in the screen that devide the light so it is bright on every sight.
(My first Glo had holes in that layer so when you put the light to bright they look like there are stuck pixels on the screen,there was a complete batch out there with this mistake)
I don't want to start a discussion about what you see, or don't see and what I see or don't see,and what color I think the old Glo has or not because there are all different kind of leds..batch A give another kind of light then batch B and there is a lot of room for interpretation.
The reactions above show much better then I can tell (english is not my native language and I have only one years lessons in the english language)
There are cheap leds, and more precision leds and depending on the led quality you can be more precisely about the colors and the "not wanted" emission.

What about the light.. Harmfull ?? Never said that.
Some studies say that the blue inside the white light (used to get white) is stimulating the brains like it is daylight, and resets the biological clock so you get awake.
But what a lot of people forget is that very much lights around us are causing the same.
Your LED tv.. your computerscreen and the light i use beside my bed is also a led light and that emits light at 5 watts... so I can filter all the blue light of my Glo HD, but the "bedlight" and all surrounding lights does exactly the same so it has almost no value to remove it from my Glo if beside the bed or the room you are, all led lightings are emitting the same white (blue) light.
(but again some specialist say that you mustbe within a range of cm or dm (decimal metres) to have the effect on it. )
In theory the only way to remove the blue totally out of the led is by giving it a yellow filter over it (like some foil or like sunglasses) .
The cheap leds they use have a bandwith of surrounding light colors and for as far as I know you can change the color but the only thing you do is changing the intensivity of the other colors to change the idea of the blue light, but it is still there,depending on the used led.
If it affects you, is depending from person to person (if it is true about resetting the biological clock because even scientists don't all agree on that.)
They do use it for depressed people to give them "daylight therapy".

Now lets stop this discussion because this is way and way to far, it was only one very small part of my personal reasons not to buy it,and only because I think the word "filter" is being misused here, it was picked out and become a part of a total other discussion about leds itself.
My Normal Glo HD has the normal leds and the normal blue light in it and it didn't bother me at all.
If I don't want it, I use my special glasses with a build in filter layer that filters out the blue light.
Since this is in regards to one of the major features of The One, I would consider it on topic, and since the OP hasn't objected, I'll continue.

So you have personal knowledge of the LEDs that Kobo is using? Looking at DNSBs graph, he says those are "typical", and I don't see much overlap of the different colors.

Again, FWIW, I don't really know. I was reading (I think it was Nate's) site, and it said there were 9 LEDs, 4 of which are RGB, so there may be more blue light than I was guessing; it all depends on how they are driving them for "night mode". Since night mode is for low light, I could see them only using the RGB LEDs, and mainly using the RG, so there could be little to no Blue.

Just a WAG.
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