b: The on-off ratios (the ratio of conductivity with/without pseudo-sunlight) of the photoresistor devices. The higher the on-off ratio, the better the performance of the photoresistor.

[Fjord Carver] brings together an RGB LED and CdS Photoresistor to make a color ... then used to extrapolate the RGB value of the test material. We saw the very same method used a couple of ...