There's been further research in this area that shows it's light exposure in general[1], not just outdoor time. There's also an interesting ongoing study to hel

There's been further research in this area that shows it's light exposure in general[1], not just outdoor time. There's also an interesting ongoing study to help determine the effectiveness of using bright artificial light as a treatment[2] [1] https://iovs.arvojournals.org/article.aspx?articleid=2684235 https://iovs.arvojournals.org/article.aspx?articleid=2684235 [2] https://clinicaltrials.gov/ct2/show/NCT04923841 https://clinicaltrials.gov/ct2/show/NCT04923841