What would be the right daytime setting in f.lux to reduce the harmful effects of blue light? The default daytime setting under recommended colors in f.lux is

What would be the right daytime setting in f.lux to reduce the harmful effects of blue light? The default daytime setting under recommended colors in f.lux is 6500K. I tend to use a daytime setting of 5500K. Is 5500K good enough to reduce the harmful effects of blue light or do I need to go even lower?