In article <heudnZwAffW9eD3YnZ2dnUVZ_tijnZ2d.RemoveThis@comcast.com>,
"mark_digital©" <976-XXX.RemoveThis@comcastnot.com> wrote:
> What most notable difference between a LED color document scanner and a
> typical color fluorescent flatbed scanner other than power consumption?
It's a guess, but I would expect the LED one to have a longer useful
life.
"White" LEDs are really blue-emitting LEDs plus other phosphors which
absorb blue and emit longer wavelengths. The combination is perceived as
white.
Fluorescent lamps are UV-emitters plus phosphors, which makes them quite
similar in way, but UV, being a shorter wavelength, is likely to cause
more damage to the other phosphors, altering the color balance more
quickly.
In either case, the phosphors *could* be chosen to compliment the color
separation process used by the scanner, but I don't know if they
actually are.
Isaac
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