> reduce their quality of life further by using one of the 2 expensive and limited E-Ink displays out there

Could you elaborate on above? I did not understand the logic behind the sentence. E-Ink displays by themselves do not generate any light as they don't have any backlight or light emitter behind the display. That's why they work in bright sunlight. Some products with E-Ink displays have frontlights for night time reading. Is that what you are referring to? If so, given this article, just turning off the frontlight and using non-blue light sources for lighting is sufficient to avoid this, right?