Lighting a fuge with natural light?

[Jaws]

Weird request but has anyone ever tried lighting a refugium with natural light before? I know if your tank sits in natural daylight that promotes algae growth so why wouldn't it work for your fuge? I know it's just as easy to use a cheap light from home depot, but for this particular idea I have in mind, it would make more sense to use natural light, still in an insulated room though.