"Bob Kuykendall" wrote in message
oups.com...
Earlier, Jim Weir wrote:

...Isn't a perfectly reflecting surface much better than
one that doesn't reflect the energy?...

In theory, yes.

In practice bare aluminum, even highly polished bare aluminum, absorbs
enough energy in direct sunlight to threaten some materials used in
bonded aluminum.

Thanks, Bob K.

Despite the obvious glare of visible light, polished aluminum absorbs far
mor solar energy than white.

Peter