Most people don't calibrate their monitors or don't know how to do it accurately. I have been a graphic designer in the print industry for 20+ years & have seen issue after issue from people who think they see one thing but are actually way off because the monitor is not calibrated & then complain because the print is "wrong". Also, most monitors are far from being able to attain, let alone hold, a perfect calibration over time. I'm sure LED lights are not "perfectly calibrated" either as most would pay the cost to do that to have the perfect light.Of course but there's control over the ratio through calibration. True white light contains all frequencies at equal intensities. To trick our eyes into seeing white you have to get the ratios just right which a crude LED bulb never does.