It's mainly the lack of red light in the regular LED's that throw off the circadian rhythm. That's mainly what I focus on now. I do have to say I haven't done my research on this myself, but took it from Jack Kruse. I did notice an improvement since I changed the light bulbs yesterday. I do 100% know there is a difference since I've put a red filter on my phone and PC screen. Without filter, my brain felt microwaved after looking at screens after a long period