In article ,
Andrew Gabriel wrote:
What you need for efficient demisting, etc, is a good even heating
source since glass is a very poor conductor. And bulbs don't provide
this.

Glueing 10 or so resistors on the back of the mirror would be
good enough.

Not enough room. The mirror is glued to a back plate which has a cutout
for the heating element and that cutout is only about 1mm deep. There
would be room for resistance wire, but making such a thing doesn't appear
easy. While etching a PCB type will be - if I can find a source of the
material I've mentioned.

--
*A fool and his money are soon partying *

Dave Plowman London SW
To e-mail, change noise into sound.