Quote:
Originally Posted by Mr.Samuel
Is there any possibility to change the KPW's frontlight?
And what's the specs of the frontlight?
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Change to what?
Give me an idea of what you want accomplished.
The specs. specific to what Amazon uses are unknown.
But I suspect they are using a standard part, not a specially grown LED.
Also, they are an edge emitting SMT package, fewer to choose from in that combination.
So I am assuming that information from what is generally available (plus similar in appearance to the eye) will be easy to look up.
I haven't (yet) looked them up.
Now the dyes, I am a little bit further along in looking things up.
What I have found so far seems to fall into two general groups:
Ones with a cut-off of 300nm and ones with a cut-off of 400nm.
That is, they block light of shorter (bluer) wavelength than the cut-off value.
Ref:
https://en.wikipedia.org/wiki/Color#Spectral_colors
If you look at the selection of tints available in an optical store, you will notice they also seem to fall into two groups: shades of brown and shades of gray.
I suspect that is not a coincidence.
For both reasons given as a non-answer to your question, it will take a bit of hands-on experimenting to determine what "works".
Too that end, I have ordered some sheets of plastic that represent my best guess at what Amazon is making that front light layer from.
Without their second surface micro-etch of course. That seems to be an Amazon (patented) exclusive.
But we only want to alter the first surface, so this material should be 'close enough'.
It will have to be a matter of trial and error (only guided by numbers) because of the human involved, see:
https://en.wikipedia.org/wiki/Checker_shadow_illusion