- A convex mirror could work, sure. A lens would be impossible to construct for the size necessary.
- I don’t get what u mean by “contrast at night”, but sure - let’s assume that you would need 5% of the power at noon. You would still need a mirror with a surface area of 5% of the area you are illuminating.
I saw this here as well haha. However, last time I liked his videos, people didn’t seem to like it. Regardless, I guess it would be better to link his vids in the TLDR.