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Old 10-17-2013, 02:43 PM   #1
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Installing motion sensor security light on Garage


Hi all, I've searched for this topic and have read them but they don't really confirm my questions.

I live in Canada in a brand new house that was built this year and have a detached garage. The exterior of the garage (facing back alley) has two (2) light fixtures (one on each side of the garage door) with regular bulbs and its wired to a wall switch inside the garage.

I would like to add either an LED motion detector or a dusk till dawn high pressure sodium light fixture (one on each side of the garage door).

I have read in some light fixtures that I am NOT to install two (2) of these kinds of light fixtures on the one wall switch.

My other option is to leave the current light fixtures and install and timer switch in replacement of the current wall switch.

Can someone please tell me if this is true that i CANNOT install either a motion LED light or HPS light on one wall switch??

Thanks for all your help!

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Old 10-17-2013, 05:17 PM   #2
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Installing motion sensor security light on Garage


i don't know any reason you can't use the motion detector light, but the hps light may excede the current rating of the switch. also the hps has to cool down like a mercury vapor light before it restrikes.so that may not be the way to go.i have a motion detector light on a switch with no problems , but it depends on the motion detector that may stay on with the switch,then you have to turn it back on to reset it so the motion detector works right. have found to be the situation with mine.

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Old 10-17-2013, 05:27 PM   #3
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Thanks for your reply but my question is am I ok installing TWO motion detector lights on ONE switch?
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Old 10-17-2013, 06:07 PM   #4
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Installing motion sensor security light on Garage


The wattage is the only limiting factor. If you add too many watts then you could trip the circuit breaker.
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Old 10-17-2013, 08:19 PM   #5
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Thanks. Do I also have to worry about how many amps the wall switch is?
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Old 10-17-2013, 10:19 PM   #6
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Installing motion sensor security light on Garage


most common ones are rated 15, but you can by 20 amp ones. i don't belive you will have an issue though.
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Old 10-17-2013, 10:23 PM   #7
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Installing motion sensor security light on Garage


Appreciate your help!
What would happen if one of the two motion lights
Turned on, would the 2nd one turn on as well?
I was looking at the Allpro dual head LED MOTION DETECTOR light.
From Home Depot.
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Old 10-18-2013, 07:38 AM   #8
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Installing motion sensor security light on Garage


The lights should not affect each other unless you install them to shine at each other. The light from one could trigger the other to turn off if it is pointed at the sensor.
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Old 10-18-2013, 08:03 AM   #9
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Just remember that depending on the fixture, HPS may not be OK at a dwelling. The limit is 1000V for open circuit.

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Old 10-18-2013, 09:48 AM   #10
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Yes, I would point the lights away from each other to ensure they don't trip one another on and off. I just didn't want to have both lights trip the breaker.

Is there a general rule of thumb on how many watts or light fixtures one 15-20amp switch can operate safely or until it starts tripping the breaker?

Thanks for all your help!
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Old 10-18-2013, 09:53 AM   #11
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yeap! just divide your watts by 120 volts, & this will give your amperage. or you can multiply amps X volts = watts. the good old thing called OHM's law.
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Old 10-18-2013, 10:03 AM   #12
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Is it true that LED put out less wattage than regular exterior light fixtures with incandescent bulbs?
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Old 10-18-2013, 10:34 AM   #13
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Installing motion sensor security light on Garage


Since you are in Canada you are limited to a 15 amp circuit for the lights. Full load 15 amps is 1800 watts. So you need to stay below 1800 watts total for the circuit.
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Old 10-18-2013, 10:51 AM   #14
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Thanks for the info on the switch rating.

Ok, so the Allpro dual head LED light I will be installing is
27 watts per unit and I will have 2 separate motion detector lights so that should be ok. I'm thinking when they quote 27 watts its per unit and not per lighthead?

This is the light i'm buying:

http://www.homedepot.ca/product/all-...e-led-s/813286
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Old 10-18-2013, 12:54 PM   #15
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Installing motion sensor security light on Garage


Even if it is per light head you won't have a problem with those.

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