u/fullgrid

Hannspree just uploaded powerpoint presentations about optimal light conditions for Hybri:

https://www.hannspree.com/downloads?categories=%2C12&type=%2C9

Someone did it

>IRIS Optronics employs a display principle entirely different from traditional electrophoretic e-Paper, achieving high durability and high color saturation display effects. It boasts excellent readability under various lighting conditions and extremely low power consumption. Furthermore, the product can generate its own electricity using solar panels, demonstrating the application potential of self-powered information signage, which was recognized by the judges.

>Now, because Modos wrote the entire code from the ground up, it gives users control over what they want to see and how they want to see it on the screen. There are multiple options to switch among dedicated display modes for web browsing, writing, or watching videos, each of which has a different mode. Users can also control saturation, front light intensity, and the warmth of the light.