Lighting through walls?

Ah ok, yes I was trying to do that, it’s just I’m pretty scared when I enclose the rooms with a ceiling it’s going to badly affect the lighting and I won’t be able to recreate the nice lighting.

As a quick question in a rectangular room approximately 750x750 how many point lights would you use to light this to give natural daylight effect and what intensity would you set these to, I’m having very mixed results with two rooms one with yellow walls and another with grey to get a similar lighting effect.

I’d really appreciate some help guys!