"Bob M." wrote in message
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"BOB" wrote in message
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I know there are motion sensors which detect movement and can turn on
a light fixture. What I was wondering is there a way to do this inside
a house? I would need one that would detect a person walking _into_
the room so the light would cut on several feet before a person enters
the room.

Can be done, but if you want it to happen -before- someone gets into the
room, it's a little more tricky. Problem is, motion sensors don't "see"
the target well when the target's motion is directly toward or away from
the detector. Since they detect motion by way of a change in heat, and you
want to do this indoors which is close to body temp (as opposed to
outside), you may well be within arm's length of the sensor before it sees
you.

It can see you in an instant from 20 feet or more if you move _across_
it's field of view however. You can adjust the sensitivity, but sometimes
the thing will be triggering the lights so often that a plain ol' switch
would be better.

Most flourescent lights won't work with these switches either.


Depends on what type you use. My office building had fluorescent lights
working with motion sensors, with no problems at all. This is why the OP
should consult an electrical supply place, or he'll be back here asking why
he keeps killing switches.