Outdoor Security Lighting: What Actually Works Once The Evenings Go Dark

Every year around the middle of October the same thing happens. You come home at six and it is already dark, and you realise you have been fumbling at the door, down a path you cannot see properly, since about the start of the month.

That is usually when outdoor lighting comes up. It is worth doing, but it is also worth doing calmly, because the version most people end up with is a single blinding floodlight over the back door that lights the shed brilliantly and the path not at all.

Is security lighting really about security?

Honestly, less than the sales pitch suggests, and it is worth saying so plainly.

Recorded burglary in Ireland has been falling. CSO figures show crime incidents of burglary and related offences fell by 12% to 8,765 in the 12 months to the third quarter of 2025. That is a substantial drop, and it does not support the idea that you need to floodlight your property out of fear.

What good outdoor lighting genuinely does, every single evening between now and March, is more ordinary. You can see the lock. You can see the step that catches people out. You can carry shopping in from the car without holding a phone in your teeth. Somebody calling to the door can see where they are going, and so can you. That is the real return on it, and it is a better reason than a scare story.

PIR, dusk to dawn, or just a switch?

There are three ways to control an outdoor light, and picking the wrong one is the most common regret.

PIR sensor. Detects movement and heat, comes on for a set time, goes off again. Right for a driveway, a side passage, a back garden, anywhere you pass through rather than sit in. The catch is aim. A PIR pointed at a public footpath or a road will trigger all evening, which annoys everybody and wears out the fitting.

Dusk to dawn. A photocell brings it on at dark and off at first light. Right for a front door or a house number, where you want a constant modest light rather than something snapping on. Running cost is very low with LED, but do not use it for anything bright.

Switched. An ordinary switch inside. Right for a patio or a seating area you use deliberately, where you do not want a sensor deciding when the evening is over. Often the best answer for garden lighting, and the one people forget exists.

Plenty of homes want two of these rather than one of them. A dusk to dawn light at the front door and a PIR on the side passage is a far better setup than one enormous floodlight trying to do both jobs.

Where should outdoor lights actually go?

Put them where you walk and where you use your hands, not where the wall happens to be convenient.

• At the door, high enough to be out of the way, angled so it lights the lock and the step rather than the visitor's eyes
• Along the path and the driveway, low and repeated, rather than one bright source at one end
• At the bins and the side gate, the two places everybody ends up at in the dark
• Not aimed over a boundary. A light that shines into a neighbour's bedroom window will cost you more in goodwill than it returns

On colour, warmer light around 2700K to 3000K looks like a house. Cold blue white light around 6000K looks like a car park and makes a garden feel unwelcoming. Brightness matters less than people expect. A modest, well aimed light beats a harsh one, because a very bright fitting creates dark patches everywhere it is not pointing, and your eyes adjust to the brightest thing in view.

What goes wrong with outdoor lighting in Irish weather?

Water, more or less always. A fitting has to be rated for where it is going, sealed properly at the cable gland, and mounted so it is not filling up from above. Outdoor circuits are protected by an RCD, so a fitting that lets water in does not just fail, it trips the power to other things as well.

This is also why it is worth thinking about the wiring rather than only the fitting. Adding a new outdoor circuit is not the same as swapping a light on an existing one. Under S.I. No. 264 of 2013, installing a new circuit is restricted electrical work, which must be carried out and certified by a registered electrical contractor. Replacing a fitting on a circuit that is already there is minor work. Worth knowing which one your job actually is before anybody starts.

The CRU and ESB Networks recommend testing your RCD twice a year when the clocks change, which lands conveniently at the end of this month. If you are adding outdoor lighting this autumn, test the RCD when it is finished. It takes a second and it tells you the protection is live.

Common questions

Are solar outdoor lights any good in Ireland?

For marking a path edge or a border, they are fine and cost nothing to run. For lighting a door or a driveway in December they are not, because they are charging in the weakest light of the year and discharging over the longest nights. Anything you actually need to rely on should be wired.

Why does my PIR light keep coming on for no reason?

Usually because it is seeing something you are not thinking about: a road, a washing line moving, heat from a vent or a flue, or a cat. Narrowing the aim and reducing the sensitivity fixes most of it. A sensor pointed slightly down at the ground you want covered behaves far better than one pointed outwards.

Can I put an outdoor socket in for Christmas lights instead?

Adding a socket to an existing circuit is minor work, and an outdoor rated socket fitted properly is far safer than running a lead out through a window. Whether it can come off an existing circuit or needs a new one depends on what is already there, and that changes what kind of job it is.

How bright should a security light be?

Far less bright than most people buy. For a domestic door or path, something modest and well aimed is more useful than a high output floodlight, which dazzles, creates deep shadows around itself and irritates neighbours. If you are lighting a large yard rather than a garden, that is a different conversation.

Doing it before the worst of it

October is the sensible month for this. The evenings have gone but the weather has not fully turned, so the work is straightforward and you get the benefit of it for the whole winter rather than putting it off until the dark mornings arrive too.