Water As Shielding

>> And you know the traditional Island Three, with those humongous
>> windows? Put the lakes over those. Edge them with beaches, and
>> you can have sailing, surfing, and swimming. Maybe even fishing.

> That's a cool idea. I wonder how that much water would affect the
> spectrum and intensity of sunlight? It'd probably still be fine,
> not as bright as a bright day on Earth, but then, that's fine with
> me (I'm always losing or breaking my sunglasses...).

I don't really know the answer to that, but the idea has come up
before. Surely somebody's done the calculations? And if water soaks
up too much sunlight, I guess you could always concentrate it.