The only time I can even consider using light mode is mid-day with plenty of natural light around. At night when all the lights are dim, even the lowest brightness on my laptop (which is quite low), plus redshift, plus blue-blocking glasses, isn't enough to be comfortable in light mode. I use the "Deluminate" extension for Chrome to make all sites dark, all the time.
Perhaps I'm unusually sensitive to light (I think I am), but based on the comments here I think I'm far from alone.