Hi, I made this.

Most of the videos are shot in real life, during summer daylight (only exception are the 2 person around a table ones, which are shot at night in a room with regular ceiling lighting).

And the projector I used is only 1100 ISO lumens; fancier models go way higher.

If you project mostly white content, it's remarkably readable + visible. Outdoors in direct sunlight would be another story, of course.