That's not it at all and nobody cares about "destructive potential" of screen-emitted photons, though. The actual reasoning behind shift to lower wavelengths is

That's not it at all and nobody cares about "destructive potential" of screen-emitted photons, though. The actual reasoning behind shift to lower wavelengths is that our circadian rhythms are entrained by ambient light, with "blue" light being assumed as indicative of daytime and "red" tones – of sunset (ergo, time to ramp up melatonin secretion and prepare to sleep).