Quote:
Originally Posted by John F
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.
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I have no knowledge of the used LED but again, changing the color isn't filtering, we talk about different things.
When you active filter something out,you don't change the color but only remove the blue light by placing something before the led, or over the led.
I do know that the manufacturer just buys batches of LED's and that I have 2 old Glo's who compared next to each other at the same brightness level do have different colors of the screen so different leds are used there. (compared to all technology in the reader,everything must be as cheap as possible so I guess the take the most cheap leds there are on the market..)
In Daylight therapy they using light of 1200-1500 lumen at a distance of 20 CM at 30 minutes a day to alter the biologic clock and relief of depression.
Ever tried it (i did) and really try to look into that light ??
Will any led ever come close to this ? Or even he sum of all leds in an e-reader ??
Forget it.. (and then we didn't speak of how much battery power that will consume..)
Average lumen of a 7 watt led is about 500 lumen..
I don't know much people who read with the light of the Glo at maximum but even then it will not become near some value that can really change your biological clock so you have troubles with sleep.
So A they don't do any active filtering so this is a sales talk and B even with all leds at max it is uncomfortable to read but still by far not enough to alter your biological clock,and that was this "filter" supposed to do.
There is just some talk that bright blue light at short distance can keep you out of sleep, I do believe that that is true, but no e-reader emits that kind of light to really alter it..it is some hoax that the light of an e-reader can keep you out of sleep that they use to sell their "comfort light feature."
But again, that is totally no reason for me to buy the reader or not, my opinion was that it is to big,no higher DPI then a normal Glo HD, I dont like the "no bezel" flat design,and I don't need any waterproof reader as I don't read in a swimming pool or bath.
If anyone does, go ahead,but comparing to an ordinary Glo HD the sharpness of the displayed txt is exacly the same and you only picked out the LED thing to get the discussion.. (no attack) which I would personally never use because I like the bright light that the Glo HD has.. the pro's are so less to the cons that for me personal I would not buy it as I find the normal Aura HD almost already to big to read in bed.
With the normal Glo and Glo HD or the Touch-2 you can use the same cover,the price of the cover needed for this one is to expensive.
The total sum of prices is to high to defend me buying it.