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I am building a temporary extension onto my garage so I have room to work
on the larger parts of my 360. My friend has a big 8'x4' skylight that I
can get for really cheap. It would give me a lot of light to work with.
However, I realized that UV may be damaging to the materials. The skylight
is advertised to block UV and not cause carpets to fade. Anyone know if
that is really enough, is UV really very damaging?

Regards,
Ed
Watsonville CA.


[Skylights (and windows in general) that are purported to block UV are
typically made with glass which has a Low-E coating, a fairly expensive
product.  The good stuff is vacuum sputtered and must be provided as one
of the panes in an insulating glass unit.  If this skylight is 4x8 and made
of glass and has a low-E coating that works well on the UV it's going
to have to be a dual-pane unit.  The pyrolitically coated products that
can be used monolithically don't have anywhere near the UV rejection
capabilities of MSVD coated products, although they do reject some.  If
it's a vacuum formed plastic skylight I'd really doubt its ability to
reject UV unless it's severely tinted, but then you'd be limiting the
lighting advantage.

If the price is right and it will really help your workshop, buy it and put
it in and then tent the underside with a white sheet.  You'll get all
the benefit of the extra light without having to worry about the UV at all.
   FWIW.       <Marv>        ]


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