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Davo, remember that peltiers are about $11 ea. from Jaycar... might be a better bet if you're buying a few of them?
I had a chat to Paul about this 5-peltier beast, made sure he knew that the best system (IMHO) was one that only cooled the mirror about 3 or 4 degrees below ambient, so that there was no danger to the mirror and also it didn't take too long to come back to equilibrium when the power's turned off.
Peltiers can be very efficient if you insulate the cold side - it's easy to go 20 or 30 degrees below ambient, this is not what's wanted for this application, so I deliberately built a very lossy system (metal tube, minimal insulation) so I couldn't accidentally cool the mirror too far.
Paul is now reconsidering that he might only need 3 peltiers, and I reckon that's enough for just about anyone :-)
cheers, Bird
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