Motion-Sensor Lights: Where to Put Them for Real Security

TL;DR: Motion-sensor lights work best mounted 6 to 10 feet high, angled down at a 30-45 degree slope, and aimed at the three spots intruders actually use: side and back doors, the gap between fences, and any path that's dark for more than 15 feet. A single 700-lumen fixture covers roughly 30 to 50 feet in a cone, so most homes need 3 to 4 fixtures, not one floodlight over the garage.

_Last reviewed: July 2026 · 7 min read_

You bought a motion-sensor light, mounted it over the front porch, and it still doesn't catch anyone walking up the side yard or cutting through the back gate. That's not a bad product, it's bad placement. The fix is mapping your actual entry points first, then matching sensor range and mounting height to each one.

Okoniq Property Hub keeps a running log of what's installed where on each property, so you're not guessing which fixture covers which corner two years after the electrician left.

Where should motion-sensor lights actually go?

The right spots are the ones a person would use to approach unseen, not the ones that look nice from the street. That means side yards, gates, the space between your house and a fence line, and any path leading to a back door or basement entry.

Front porch lights get all the attention because they're visible from the sidewalk, but FBI burglary data consistently shows most residential break-ins happen through side or rear doors, precisely because those spots are dimmer and less visible to neighbors. A single fixture at the front door with nothing covering the side gate leaves the exact route a burglar prefers. Walk your property at dusk and note every stretch that stays dark for more than 15 feet. Each one is a candidate location.

Garages and driveways matter too, especially if you're a landlord managing a rental where tenants come and go at odd hours. A motion light at the driveway entrance that also covers the path to a side door does double duty without adding a second fixture.

How high and at what angle should you mount them?

Mount motion-sensor lights 6 to 10 feet off the ground, angled down 30 to 45 degrees. Higher than 10 feet and the passive infrared (PIR) sensor loses sensitivity to body heat because the detection cone spreads too thin by the time it reaches ground level. Lower than 6 feet, and the light throws harsh shadows that actually make faces harder to identify on camera footage.

The angle matters as much as the height. A fixture aimed straight down only lights a small circle directly below it, missing anyone approaching from 15 or 20 feet out. Angling the sensor toward the direction of expected foot traffic, like a walkway or driveway edge, gives the PIR sensor time to trigger before someone reaches the door. If you're mounting near an eave or overhang, check that the roof line doesn't block the sensor's downward field of view. This is also a good time to check your soffit and fascia condition since you'll likely be running wire near the roofline. If the wood there is soft or the fascia is pulling away, that's worth fixing before you drill new mounting holes, and it overlaps with the kind of issue covered in 5 signs your roof is aging faster than it should.

Which sensor type and brightness level do you actually need?

For most homes, a dual-tech sensor combining PIR with microwave detection cuts down false triggers from tree branches or passing cars while still catching real movement. Basic single-PIR units are cheaper, usually $15 to $30 per fixture, but they trigger on temperature change alone, which means every warm gust of wind or stray cat sets them off.

Brightness should match the space, not just be "as bright as possible." A 700-lumen fixture covers a 30 to 50 foot cone, enough for a driveway or side yard. A full floodlight at 3,000+ lumens is better suited for a large detached garage or a commercial-style rental parking area, but it will also light up a neighbor's bedroom window if aimed wrong, which becomes a dispute you don't need.

| Wired Fixtures | Solar/Battery Fixtures | |---|---| | Consistent brightness, no recharge lag | Brightness drops in cloudy weeks | | Needs an electrician or existing outlet run | Install anywhere, no wiring | | $80-$200 installed per fixture | $25-$60 per fixture, DIY | | Best for driveways, garages, main entries | Best for sheds, fence lines, secondary spots |

If you're adding wired fixtures to an older property, confirm your panel can handle the additional circuit load, especially if you're also running cameras or a doorbell system off the same panel. This is worth checking against 100 vs 200 amp service: do you have enough power before an electrician quotes the job.

How do you avoid false triggers and blind spots?

Keep the sensor's field of view clear of anything that moves in the wind, meaning tree branches, tall grass, or flags within 10 feet of the fixture. Trim back foliage before installation rather than after three weeks of nightly false alarms train you to ignore the light entirely, which defeats the purpose.

Overlap your coverage zones slightly. Two fixtures with a small overlap at the edges catch someone moving between them, while two fixtures with a 5-foot gap create a blind spot that's easy to walk through unnoticed. If your property has an older electrical system, confirm the outlets you're tying into are properly grounded before adding new fixtures. Homes still running on outdated wiring sometimes have circuits that weren't designed for added load, which is covered in 5 signs you still have knob-and-tube wiring in your home.

Do motion lights need a dedicated outlet or circuit?

Most single fixtures draw very little power, under 100 watts even at full brightness, so they rarely need a dedicated circuit. But if you're wiring into an outdoor outlet that predates 2008, check it's a grounded 3-prong type rather than an old 2-prong setup, since motion sensors and any connected smart hub typically require a ground path to function safely. If you're unsure what you're working with, 2-prong vs 3-prong outlets: how to upgrade safely walks through the difference before you tie anything in.

FAQ

Do motion-sensor lights actually deter burglars?

Studies on residential lighting suggest well-placed exterior lighting reduces opportunistic break-ins because most burglars avoid spots where they might be seen or recorded, and sudden light triggers that reaction immediately.

What's the ideal mounting height for a motion-sensor light?

6 to 10 feet is the sweet spot for most PIR sensors, balancing detection range with even, non-glaring light coverage at ground level.

Are solar motion lights as reliable as wired ones?

Solar units work fine in most climates but lose brightness after several cloudy days in a row, so they're better suited to secondary spots like sheds or fence lines rather than a main entry door.

Can I install a motion-sensor light myself without an electrician?

If you're replacing an existing fixture on the same wiring, yes, most homeowners can do this safely in under an hour. If you're running new wire or adding a circuit, hire a licensed electrician.

How many motion lights does an average house need?

Most single-family homes need 3 to 4 fixtures covering the front entry, back door, and any side yard or gate access, rather than one large floodlight trying to cover everything.

This is educational information, not electrical or safety advice. Call a licensed electrician if you're unsure about wiring capacity, grounding, or circuit load before installing new fixtures.