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In (v) wrote:

Yes its conveniently self-contained. But it might actually work
better if the light that was switched to the opener was a separate
piece on a short cord, so that it could be mounted to something else
like the ceiling on a different joist.

But then nobody would buy it because it is more trouble to put up, oh
well.

I built exactly such a contraption, using an SPST 110V relay from Radio
Shack. I screwed an outlet adapter into the lamp socket on the opener, and
power the relay coil from that. I have a second line plugged into an
adjacent outlet and switch that through the relay contacts to several
hardware-store ceramic lamp sockets mounted on joists.

The lamp socket on the opener itself was only rated for 60W; this solves
that problem too.

--
Bert Hyman St. Paul, MN