BTW, the Astronomy community has known the correct answer forever, which is to ONLY use red light. This is achievable on OLED phones using software like (on an

BTW, the Astronomy community has known the correct answer forever, which is to ONLY use red light. This is achievable on OLED phones using software like (on android) Cf.Lumen, and setting it to a full redshift mode. You will notice literally ZERO eye strain, even in the middle of the night, when you use this. https://en.wikipedia.org/wiki/Biological_effects_of_high-energy_visible_light#Concerns_regarding_prolonged_exposure_to_blue_LED_light https://en.wikipedia.org/wiki/Biological_effects_of_high-ene...