On 1/15/2013 1:04 AM, anorton wrote:

snip
reflector. Also, make the reflector a CPC design (compound parabolic
concentrator, see for example:
http://www.fossilfreedom.com/increase-output.html ) so it does not have
to be tilted throughout the day.

This is interesting. Anybody built one and evaluated it?
While it looks rational, I wonder about stuff that's been around
for decades, looks vastly superior, but is not in general use.
How come it's not standard construction?