Interesting article. It shows that light does affect the brain. Reading some forums for more info on it and seems that some people are using different frequencies and lights for different ailments and functions.
https://www.thesun.co.uk/living/2350429/flashing-lights-could-stop-alzheimers-disease-in-its-tracks/
https://www.thesun.co.uk/living/2350429/flashing-lights-could-stop-alzheimers-disease-in-its-tracks/