Quarl, Re-silver reflectors?
I play with telescope mirrors and they don't silver those suckers anymore..
Use vapor deposited aluminum and transparent sealing coatings....Plenty good reflection.....
Process is: Put parts in a vacuum container, zap some aluminum wire with high voltage to vaporize it and it mists aluminum vapor all over on your parts.
Mebbe some telescope oriented shop that re-coats mirrors would be another source for coating.
Reflectance is also largely determined by surface finish. Gotta pollsh the surface waaay down for efficiency....
Hey! That reminds me, I bought a very high voltage power supply from work made specifically for sputtering coatings in a vacuuum..... Stuck it into a corner of the garage and forgot about it... What was I gonnna do with that again?
Ken