Simulate iOS's "reduce white point" feature on OS X El Capitan
This is a solution that work nicely, but it is not free.

Gamma Control - is a professional app to control the brightness of color on your mac. Really useful to correct color &amp; black on any projector, that's why I paid for it at first ~25$.

Get it in the App Store

The put these setting on:

1- Max brightness on you mac

2- In Gamma Control put the White Point Luminance as you like (between 0.3 and 0.6 I enjoy)