I use only dark schemes for programming and is way more relaxing for my eyes. One of the reasons is that the minimum brightness of my screens are just too bright compared to ambient light at night, and I love my ambient light at night, that is quite bright but illuminates all the room, so I can work on the room, and use things like blackboards or notepads, not just the computer screen. It hurts my eyes to have white…
If you're on a Mac, there are several freeware utilities to do exactly that, Shady was at one point the most popular. I assume there are similar utilities for Windows and Linux.
They work by lowering the RGB intensities of all the pixels on your screen, instead of lowering the backlight further. It has exactly the same effect in the end.