Pat skrev den 08-04-2014:
Just a side note... You have mentioned dyes and food coloring a couple
of times. Remember that most LEDs produce a single color. You can't
filter them to change the color. Any filter only dims them. (The
obvious exception is white LEDs that use phosphors to produce a range
of colors. They can be filtered just like incandescent bulbs).

Not nessecarily. If the white is produced by mixing blue and yellow
(phosphors), it looks white, but colours are still missing.

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