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Old 10-28-2010, 10:01 AM   #1
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Light switch vacancy detector, on two switch circuit


Hoping one of the pros can lend a hand.

I have a ceiling light controlled by two light switches on either side of the room. I have a growing problem with these lights being left on all night, and I'd like to see if technology can help.

I found a light switch with vacancy detector and think this could work. It will shut off the light automatically after x minutes of non-motion.


http://www.amazon.com/Heath-Zenith-S.../dp/B001B5K6LG

Two questions:

1) Can I use something like this in a three-way circuit? (if it matters the light is inbetween the switches).

2) I read where a couple people said that the vacancy switches do not work with CF bulbs (instead of turning them off, they cause the bulbs to flicker). Is this pretty true of all vacancy switches?

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Last edited by sheslostcontrol; 10-28-2010 at 10:08 AM.
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Old 10-28-2010, 10:42 AM   #2
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Light switch vacancy detector, on two switch circuit


You have to look at the specifications for both questions. Usually switches like that (more frequently called 'occupancy sensors") require a neutral to be used with CFLs.

They sell these types of switches at HD, Lowes, etc - the boxes should say if they support 3-way configuration (a lot do) and CFLs.

This one looks like what you want:
http://www.smarthome.com/2523W/Levit...r-White/p.aspx

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Last edited by secutanudu; 10-28-2010 at 10:48 AM.
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Old 10-28-2010, 11:35 AM   #3
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Light switch vacancy detector, on two switch circuit


You have a three way switch loop, so any replacement switches would have to be three way. The one you show above will not work in your situation unless you are willing to give up the three way capability.

"This one looks like what you want" Shown above.
http://www.smarthome.com/2523W/Levit...r-White/p.aspx __________________

Last edited by J. V.; 10-28-2010 at 11:38 AM.
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Old 10-28-2010, 11:54 AM   #4
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Light switch vacancy detector, on two switch circuit


Didn't think of that - if the switch requires a neutral, he probably doesn't have one...
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Old 10-28-2010, 02:55 PM   #5
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Light switch vacancy detector, on two switch circuit


Two good points. The neutral and the load required to switch the motion detector. The CFL's do not pull much current at all. I am not sure motion detectors require a good load to switch or not?
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