Another way to approach dithering is to analyse the input image in order to make informed decisions about how best to perturb pixel values prior to quantisation. Error-diffusion dithering does this by sequentially taking the quantisation error for the current pixel (the difference between the input value and the quantised value) and distributing it to surrounding pixels in variable proportions according to a diffusion kernel . The result is that input pixel values are perturbed just enough to compensate for the error introduced by previous pixels.
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# Tear down when done
Part of the problem may be that none of the light is really directed forward and at the sleeper's face. Even the Dreamie's lamp mode at maximum brightness seems to have more reach than the sunrise feature. (And a note on the lamp, while it's decently bright, it's still a bit too dim for reading in bed unless I'm huddled up to it.)