Laptop (and phone) displays don't seem to have this problem, the brightness goes really low...
How does one find these "hidden" features?
Unfortunately it doesn't reduce the dimmest level on my MBP. The bottom 4 subdivisions look identical. Like level 0.25, 0.50, 0.75 and 1.00 are all the same brightness, only 1.25+ starts to get brighter.
The lowest level is still too bright at night. That's unfortunate.
However it does reduce the dimmest level of the keyboard illumination!
That's great. I always found the keyboard too bright at its lowest level at night, but some illumination at night would be helpful for obvious reasons. Now I can enjoy 3 subdivisions lower - thank you :-)
LCDs have poor blacks because they're a filter put in front of a lamp, so to render black, they have to try and block as much light as possible, but our visual perception is logarithmic and adaptive, making them look quite bad. The workaround is to add bias light behind the monitor; it quite literally provides a bias for the eye to keep it inside a certain adaption range, which reduces the perceived poorness of dark tones. (It also is more ergonomic.).