Effective use of natural sunlight in a habitat.

On 26/07/07, joe@... wrote:
> Filtering isn't an answer, because most
> filters work by absorbing the unwanted frequencies, converting them to
> heat as well. Dichroic mirrors (which selectively reflect certain
> frequencies) are possible but quite expensive.

Um. Why are they? I'm guessing, but as I understand it they're vacuum
manufactured items... you take some glass and you lay down a thin
layer of dielectric on top... and hence they're more expensive to
produce on the ground due to all the messing about with pressure
vessels needed... dichroic mirrored glass could well be a lot cheaper
to make in space.

Needs looking at more closely, but you shouldn't assume costs would be the same.

> - Joe

--
-Ian Woollard

"I think we all would have been a lot happier if they hadn't landed a
man on the moon. Then we'd go: 'They can't make a prescription bottle
top that's easy to open? I'm not surprised they couldn't land a man on
the moon. Things make perfect sense to me now.' "