Constraint about the mirror/light source.

[junjieim]

I really appreciate your idea! Thank you for show it to us!

I'm trying my mirror now and have met some problem.

Firstly, the spot effect is not ideal:

1. It's size is too big.
2. Different spot has vary different size. Let me show you the photo below. Have you met this problem before?

Secondly, I realize you used the sun light for your light source. As my understanding, the parallel light source is better. But I want to use it indoor. Can you give me some advice about concentrated light source? Will he cause some unexpected issue? Unexpected spot pattern etc.?

Thank you advance for your reply.