I just finished upgrading my white light LED 8x10" enlarger light source to variable contrast LED. I had 12 LEDs in the white light source and wanted to keep the same level of illumination. This time I used 12 green and 12 royal blue LEDs with a 20K Ohm potentiometer to control the color from all green, mixed green and blue, to all blue. The pot is going to be replaced with a version that has better resolution.
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