How Do You Choose the Right PIR Security Light or Floodlight?

QUICK ANSWER:

Choose PIR for movement-triggered security and deterrence, photocell for continuous dusk-to-dawn lighting on a path or entrance. From there, match wattage and lumens to the area being lit, colour temperature to the setting, and IP rating to how exposed the position is, IP44 suits a covered porch, IP65 suits a fully exposed wall or post.

The evenings are drawing in, and from late September a driveway or entrance that's had daylight coverage all summer suddenly needs help after dark. Choosing outdoor security lighting means specifying the right sensor, wattage and IP rating for the job, not just the right fixture. Harbro stocks security-lighting variants across floodlights, wall lights and solar fixtures, spanning several brands with real differences between them, not just cosmetic variations on products that all do the same thing. This guide covers what PIR and photocell sensors actually do, how wattage, lumens and colour temperature affect coverage and tone, and how IP rating decides what a fixture can handle, so the right spec gets chosen for the position rather than guessed at.

What Is PIR Security Lighting?

PIR stands for Passive Infrared, a sensor that detects the change in infrared heat given off by a moving body, a person, a vehicle, anything warmer than its surroundings, crossing its field of view. Four settings matter when specifying one:

• Detection range is how far from the fixture the sensor can pick up movement before it triggers. Too short and it won't catch someone until they're already at the door, too long and it starts triggering on things well outside the area that actually matters, a pavement, a neighbour's driveway. Domestic fixtures typically run 6 to 8 metres, Harbro's solar Lunar range sits at the lower end of that.

• Detection angle is how wide the sensor's field of view is, not how far it sees but how much ground it covers side to side. A narrow angle suits a single, direct approach, a wide one suits a corner position or anywhere movement could come from more than one direction. Harbro's Hispec wall light covers 120°, wide enough for most single-fixture positions, though a corner mount covering two separate approaches may still need a wider angle or a second fixture.

• Time delay is how long the light stays on once movement stops being detected. Set it too short and the light cuts out while someone's still approaching, too long and it's running well past the point it's actually doing any security job. The Hispec is adjustable from 10 seconds up to 12 minutes, wide enough range to set deliberately for the position rather than leave on whatever it ships with.

• Lux threshold is a different setting entirely, not about the sensor's reaction to movement but about how dark it needs to get before the sensor arms itself at all. Set too high and the light won't trigger until well after dark, set too low and it arms too early, in daylight or at dusk when it isn't needed yet. The Lunar range gives a concrete figure for this one, its Mode B arms at under 30 lux, roughly the light level of deep twilight.

Not every PIR fixture publishes numbers this precise, several ranges state that PIR is included without giving the exact range, angle or delay. Worth checking the individual product listing before assuming a spec that isn't stated, or calling the Peterlee trade counter, the team can confirm the actual figures for a specific fixture before you order.

PIR vs Photocell: What's the Difference?

Two different technologies, often confused, doing two different jobs.

The same split shows up within a single product range, not just across different fixture types. Diamond's Tatton range includes both, the TA1P and TA2P models run on photocell, automatic dusk to dawn, rather than movement detection.

They're not mutually exclusive. Harbro's solar Lunar range genuinely combines both in a single fixture, the light activates at dusk on a low, energy-saving setting via its light sensor, then switches to full brightness when its PIR detects movement, before dimming back down after the delay period. That's the practical answer for anyone who wants both continuous low-level visibility and a brighter response to movement, without running two separate fixtures.

Wattage, Lumens and Coverage: What Do the Numbers Actually Mean?

Wattage measures power draw, not brightness. Lumens measure the actual light output, that's the figure to compare when judging how bright a fixture will be. Two floodlights at the same wattage can output very different lumens depending on the LED technology used, which is why "higher wattage" alone isn't a reliable way to judge coverage.

Across Harbro's range, the relationship looks like this:

Several product pages describe a floodlight as replacing a specific wattage of halogen or metal halide, for example a 50W LED floodlight replacing a 250W halogen. That's a legitimate comparison, not just a marketing line, LED produces far more light per watt than halogen or metal halide, so a genuinely lower-wattage LED fixture can match or exceed the output of a much higher-wattage legacy one. It’s worth checking the actual lumen figure against the space being lit rather than relying on the replacement claim alone, coverage still depends on beam angle and mounting height, not lumens in isolation.

Colour Temperature: Warm or Cool White?

Measured in Kelvin (K), colour temperature sets the tone of the light, not its brightness. Lower numbers look warmer, closer to traditional halogen, higher numbers look cooler, closer to daylight.

Several ranges at Harbro make this a genuine on-site choice rather than a fixed spec. Bell's Skyline Omni range offers 3CCT selection, 3000K, 4000K and 5000K, switchable in the fitting itself. Diamond's Dunham range offers the same kind of selectable range. Kosnic and Novah's ranges tend to run at a fixed 4000K to 6500K depending on model.

As a rough guide, 3000K suits a domestic entrance or porch, where a warmer tone feels more welcoming. 4000K is a practical middle ground for most driveways and general security use. 5000K to 6500K, a cooler, daylight-like white, suits commercial yards, car parks and warehouses, where visibility and contrast matter more than atmosphere.

IP and IK Ratings: How Exposed Is the Install Position?

The IP (Ingress Protection) rating is two digits, the first for solid particle protection, the second for water. IP65, the rating on most of Harbro's floodlight range, means fully dust-tight and protected against water jets from any direction, the standard for a genuinely exposed outdoor wall, post or eave position.

Not everything at this end of the range is rated the same. Harbro's Hispec wall light is IP44, splashproof rather than jet-proof, protected against solid objects larger than 1mm and water splashing from any direction, but not a direct, sustained jet. That's the right rating for a covered porch or canopy where the fixture isn't in direct, driving rain, but it's the wrong choice for a fully exposed gable end or a detached outbuilding wall.

A separate rating worth knowing alongside IP is IK, impact resistance rather than weather resistance, how well the housing stands up to a physical knock rather than dust or water. Novah's Onyx range is rated IK07, a genuinely different spec to its IP65 water and dust rating, worth checking on any fixture going somewhere it might get struck, a low wall position near a driveway, for example, rather than assuming a high IP rating covers impact too.

Which Range Fits the Job?

Diamond Dunham, the most flexible range for choosing sensor or non-sensor at the same spec level. Available in 10W, 20W, 30W and 50W, black or white casing, with or without PIR built in, across the full wattage range, 16 configurations in total. The version with PIR includes the 4th-wire override or slave function and 2-year warranty. The right starting point when PIR is wanted as standard rather than an add-on.

• Bell LED Floods, built around flexibility of output rather than sensor integration. Several Skyline Omni models offer switchable wattage and selectable colour temperature in one fitting, 15W to 200W depending on model. PIR is a separate, plug-in accessory (the 72034 sensor), compatible across the 10W to 50W models. The right choice when adjusting light level or colour temperature on site matters more than having sensor and light in one unit.

• Kosnic LED Floods, straightforward, fixed-spec floodlights at 100W, 150W and 200W, no PIR in what's stocked. Backed by a notably longer 5-year product warranty (2 years on-site). The choice for reliable high-output lighting where sensor control isn't required and long-term backup matters, a permanently lit yard or loading area, for example.

• Novah LED Floods, high lumen output across 50W, 100W, 150W and 200W, 2 to 3-year warranty depending on model. PIR is available as a genuine variant, in line with how Novah offers it across their other ranges, but it isn't included as standard, and exactly how to specify the PIR version is worth confirming with the trade counter rather than assuming it's a simple option at checkout.

• Solar Lighting, the Lunar range, PIR standard across every model, genuinely wire-free, battery and solar powered, 2 to 3-year warranty depending on model. The right answer wherever there's no power run to the fixture position at all, a boundary wall, a detached shed, a front door with no nearby circuit.

• Outdoor wall lights, PIR or photocell wall-mounted fixtures, like the Hispec for movement detection or the Helix for dusk-to-dawn, the smaller-scale alternative to a floodlight, suited to an entrance, porch or doorway rather than a driveway, car park or perimeter.

Not sure which of the floodlight brands fits the job? See the full commercial flood lights range, or the curated cross-brand security lighting collection.

Do You Need an Electrician?

Depends on the work, and depends on the nation.

In England, adding a new light fitting or PIR floodlight to an existing outdoor circuit is generally not notifiable work under Part P, outdoors hasn't been classed as a special location there since the 2013 amendment. Installing a genuinely new outdoor circuit, powering a previously unwired shed, outbuilding or a fixture with no existing supply nearby, is notifiable, and needs either a registered electrician who can self-certify or notification to local authority building control before work starts.

In Wales, outdoors is still classed as a special location, so the position is wider: both a new circuit and any addition or alteration to an existing outdoor circuit are notifiable. Straightforward like-for-like replacement of an existing fitting, and genuine repair or maintenance, aren't notifiable in either nation, that exemption applies regardless of location.

Either way, and regardless of whether the work is notifiable, all outdoor electrical work must comply with BS 7671, including RCD protection on the circuit. For anything beyond a straightforward like-for-like fitting swap, or for any new circuit or genuine addition, call a qualified electrician rather than assume it's a simple DIY job.

Outdoor Security Lighting: Frequently Asked Questions

What's a good detection range for a driveway?

6 to 8 metres covers most domestic driveways from a single wall or post-mounted fixture. A longer driveway or an angled approach may need a wider detection angle, or a second fixture covering the far end, rather than relying on range alone.

Can PIR and photocell work together on one fixture?

Yes. Harbro's solar Lunar range combines both, a dusk trigger for baseline visibility, then a brighter response when the PIR detects movement, dimming back down after the delay period. Not every fixture combines the two, check the individual product before assuming it does.

Can a PIR sensor be added to a floodlight that didn't come with one?

Bell's 72034 plug-in PIR sensor is designed and rated specifically for the Skyline Omni range, 10W to 50W models. Nothing in Harbro's Kosnic or Novah ranges points to the same retrofit option, don't assume a non-PIR floodlight from a different range can take an add-on sensor without checking compatibility first.

Is fitting a PIR floodlight notifiable electrical work?

It depends on the nation and what's actually being done. In England, adding one to an existing circuit outside a special location generally isn't notifiable, installing a new circuit to power one is. In Wales, outdoors counts as a special location, so both a new circuit and an addition to an existing one are notifiable there. A genuine like-for-like swap of an existing fitting isn't notifiable in either nation.

Can a security light run entirely off solar with no mains connection at all?

Yes. Harbro's Lunar solar range is genuinely wire-free, no mains connection needed anywhere, PIR included as standard. The trade-off is charge-dependent brightness and duration rather than the constant output of a mains-powered fixture.

How long does a solar security light take to charge, and how long does it last?

On the higher-capacity Lunar models, as little as 6 hours in bright sunlight for a full charge. The Li-ion batteries are the replaceable 18650 type rather than sealed in, so the fixture doesn't need replacing when the battery eventually does. Rated life across the range is 20,000 hours.

What's the difference between Diamond's two floodlight ranges?

Dunham is the more fully specified range, 10W to 50W, black or white, with or without PIR, full published spec including dimensions and beam angle. Tatton is a separate range that actually runs wider than Dunham, 10W to 50W in its slimline TA1 line, up to 150W in the larger TA2 line, and includes photocell as well as PIR variants. Both are genuine Diamond ranges, not duplicates of each other.

What's a sensible time delay setting for a PIR security light?

It depends on the position. Something covering a door or gate that people pause at, a minute or two is usually enough. Something covering a driveway a car passes through quickly can run shorter. Most adjustable PIR fixtures, the Hispec included, offer a wide enough range, 10 seconds to 12 minutes on that model, to set it deliberately rather than leave it on a default.

Does outdoor security lighting work alongside CCTV?

Yes, and the two are commonly specified together. A PIR floodlight covering the same approach as a camera adds visible deterrence and better-lit footage at exactly the moment motion is detected, rather than relying on the camera's own night vision alone. See Harbro's CCTV hub for the camera side of that pairing.

Can I collect these same day from the Peterlee trade counter?

Yes, the full range across all brands is held in stock at Harbro's Whitworth Road trade counter. Same-day collection during opening hours: Monday to Thursday 7:30am to 5:00pm, Friday 7:30am to 4:00pm, Saturday 8:30am to 12:30pm.