In article ,
"Dave Plowman (News)" writes:
In article .com,
Mr Harry wrote:
If there is sufficient space withing the mirror housing, mount a
couple of 12v bulbs in there. You will probably need to paint the bulbs
to prevent the light coming around the edge of the miorror glass.

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.

--
Andrew Gabriel