Motion Sensor Outdoor Lights

A motion sensor light is the only fixture that pays for itself in not fumbling for keys. Arms full of groceries, snow underfoot, dark by 4:30 — the light comes on before you reach the step. It's also the cheapest meaningful security upgrade to a house, because an unexpected light is what makes someone reconsider.

The two numbers on the spec sheet

Detection range — typically 20 to 70 feet. Longer isn't automatically better: a 70-foot sensor on a suburban driveway will trigger every time a car passes on the street.

Detection angle — usually 120° to 270°. A 180° sensor covers a wall face; 270° suits a corner where you want coverage on two elevations.

Match the range to the actual distance you want covered and no more. Over-ranging is the single most common cause of a motion light people end up disabling.

Cold weather is the real test

Most exterior motion sensors are passive infrared — they detect the difference between a warm body and the background. That's straightforward at +20°C.

At -25°C, the contrast between a person in a parka and the surrounding air changes, and cheaper sensors become erratic — false triggers, or missing you entirely. Check the stated operating temperature range on the product page. Anything not rated below -20°C is a three-season fixture in most of the country.

Snow is the other factor: a sensor lens under a drift or iced over stops working. Mount high enough and under enough overhang that it stays clear.

Settings that matter

Duration — how long it stays on after triggering. One to five minutes is usually right. Thirty seconds means it goes dark while you're still at the door.

Sensitivity — turn it down if the light is triggering on cats, branches or blowing snow.

Dusk-to-dawn mode — many fixtures offer a low ambient level all night that brightens on detection. This is the most useful setting for a walkway: some light always, full light when needed.

Rating and installation

Wet-rated, sealed housing, with a CSA or cUL mark. The sensor module is an additional water-ingress point, so gasket quality matters even more than on a plain fixture.

Replacing an existing exterior fixture on an existing box is a reasonable DIY job with the breaker off. A new exterior location needs cable, and in most provinces a permit.

From a Canadian company that has stood at a dark door in January with an armful of bags.

Frequently asked questions

What detection range do I need?

Match it to the distance you actually want covered — 20 to 30 feet for a door, more for a driveway. Over-ranging causes constant false triggers from passing traffic.

Do motion sensors work in extreme cold?

Quality ones do. Passive infrared sensors rely on temperature contrast, which changes at -25°C. Check the stated operating temperature range; anything not rated below -20°C is effectively three-season.

Why does my motion light keep triggering?

Usually sensitivity set too high, or range set too wide. Cats, branches and blowing snow are the common culprits.

What's dusk-to-dawn mode?

The fixture holds a low light level all night and jumps to full output on detection. The most useful setting for a walkway.

Do they need to be wet-rated?

Yes. The sensor module is an extra point of water ingress, so sealed housings and gasket quality matter more than on a plain fixture.