While I totally agree that brightness is a very important factor, there is another very significant one, front surface reflection. See more in my comment here:

While I totally agree that brightness is a very important factor, there is another very significant one, front surface reflection. See more in my comment here: https://news.ycombinator.com/item?id=8124039 https://news.ycombinator.com/item?id=8124039 However, in my experience, resolution matters too. I increased the font-size on my monitor and saw a clear impact on readability.