I started searching around. Could it be this reply within forum?
https://forum.justgetflux.com/topic/4056/blue-light-screen-b...Contains a link where a graph (which I don't understand) is almost identical with and without sleep shield.
lorna F.LUX TEAM Aug 17, 2017, 5:48 AM
And here is the same iPad with one of the many filters that claim to help sleep (unless they are a deep orange, most of them do absolutely nothing): https://fluxometer.com/rainbow/#!id=iPad%20Pro/6500K-iPad%20Pro&filter=filter/SleepShield
But that SleepShiled looks like is a physical device actually.
https://www.amazon.com/SleepShield-iPad-Blue-Light-Filter/pr...
