Display screens of computers and hand-held devices are an important source of uncontrolled blue light. Americans spend 7 hours a day, Brits 6 hours and South Africans 9 hours in front of blue-pump LED screens.¹ Many of those hours are in the evening when the blue light disrupts circadian clocks and can cause ill-health. Korrus has developed prototype white computer screens that automatically and imperceptibly switch between 20% sky blue light during the day and less than 2% blue at night. 1: Moody R. (2023) Screen Time Statistics: Average Screen Time in US vs. the rest of the world Archived November 20, 2023 at https://perma.cc/3E6V-HXAG .