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You are correct. The expected color values were the potentiometer values and the experimental were read from the display.The "white balance" function initially sets the RGB value of the Neopixel to 255,255,255 respectively. The sensor takes the intensity from this initial value and scales down the values on a 0-255 range. Anything more intense than the initial brightness creates error. Have you checked out the code? If you are familiar with Arduino, the code will show you the exact method.
Sensing Light - Determining Exact RGBW Values
Sensing Light - Determining...View Instructable »
Make 4 Useful Things From 9V Dead Battery
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