Walk into a well-stocked lighting showroom in spring and the shelf labels start shouting numbers: 12V, 230V, IP65, 3000K, 3W, 180 lumens. None of them tell you whether the fixture will still switch on after three winters, or whether it will throw a hard white glare across your terrace at ten o'clock at night. That is what the specifications are for, once you know which handful actually matter. There are perhaps five, and after that most buying decisions get noticeably easier.

Voltage: The First Decision

Almost every garden fixture in Europe runs on one of two voltages. Mains voltage means 230V in Italy, wired straight into the household supply. Low voltage usually means 12V, fed through a transformer or driver that steps the current down before it reaches the garden.

The appeal of 12V is safety. It is classified as safety extra-low voltage, which means a damaged cable or a flooded connection is unlikely to give anyone a dangerous shock, and you can run cable through a flowerbed with a good deal less worry. The trade-off is physics: at 12V, voltage drops quickly over distance. Push twenty metres of thin cable to a run of five fittings and the last one will glow dimmer than the first, or flicker when the temperature drops. Low-voltage systems also need somewhere to put the transformer, and that spot has to stay dry and reachable.

Mains voltage handles longer runs and higher wattages with less fuss, and there is no transformer to hide. But every connection needs to be genuinely waterproof, not merely wrapped in tape, and in Italy fixed outdoor electrical installations generally need to be carried out or certified by a qualified electrician who issues a declaration of conformity. That paperwork matters if you ever sell the house or claim on insurance. A tidy DIY joint is still not a certified circuit.

IP Ratings, Decoded

The IP number on the box tells you how well a fixture keeps out solids and water. Two digits: the first for dust and fingers, the second for water. You will rarely see anything below IP44 in a garden context, and you should be suspicious of anything that does not state a rating at all.

• IP44 — protected against objects over 1mm and splashing water. Fine under a deep porch roof; not fine in a border.
• IP65 — dust-tight and resistant to water jets. A sensible minimum for anything fully exposed to Italian rain.
• IP66 — survives powerful jets, the sort you might use when hosing down a terrace.
• IP67 — survives temporary immersion, roughly a metre for half an hour.
• IP68 — continuous immersion, to a depth and duration the manufacturer specifies. This is what fountains and pond lights need. Beds do not.

Two cautions. The rating describes a sealed, undamaged fixture as it left the factory; the cable gland and the connector are almost always the first points of failure, not the housing. And a high IP number says nothing about how well a fitting resists UV, salt air or corrosion. A cheap IP68 plastic spot can still be scrap inside two seasons.

What Separates a Good Fixture From a Cheap One

Materials

Die-cast aluminium with a proper powder coat, 316 stainless steel and solid brass all age well outdoors. Thin plastics go brittle under sunlight and crack at the gland; painted mild steel rusts from the inside out. If a fixture is going to sit in soil or a gravel bed, look at the body, not the box photo.

Seals and glands

Silicone gaskets outlast cheap rubber ones. A proper cable gland grips the sheath rather than the inner wires. If the fixture has a rubber plug over a cable entry with no gland at all, water will find it.

The light engine

Most garden fixtures now use integrated LEDs, which means when the LED fails, the whole fitting goes. That is not necessarily a reason to avoid them, but it is a reason to buy from a brand that will still exist in five years. Check colour temperature (2700K to 3000K is warm and flattering for planting; 4000K reads cooler and more clinical) and keep it consistent across the garden. Also check beam angle: a 10–15° spot is a narrow pencil of light, while 60° washes a broad, soft pool.

Matching the Fixture to the Job

Lighting a garden is mostly about placing the right beam in the right place, not about buying more lights.

• Paths and steps: low, shielded fittings around 30–60cm high, aimed down, wide beam. You want to see the edge of the paving, not the lamp itself.
• Trees and shrubs: narrow-beam uplights set close to the trunk, angled up through the branches. Two fittings on a large tree read better than six.
• Walls and fences: asymmetric wall washers or grazers mounted slightly off the surface so the texture catches the light.
• In-ground: recessed IP67 fittings with drainage, placed where nobody will walk, mow over them, or trip.
• Pergolas and seating areas: decorative string or festoon on a covered circuit, kept away from sprinkler spray.

Cable, Connections, and the Voltage-Drop Trap

Use cable made for outdoor use — rubber-sheathed H05RN-F or H07RN-F is the standard choice — rather than ordinary indoor flex, which stiffens and splits in the cold. Bury it in conduit or clip it securely along a wall, and leave a little slack at each fitting so the cable is not under tension.

On a 12V system, plan the runs before you dig. Keep each run modest in length, use thicker cable such as 2.5mm² where distances grow, and split the garden into zones fed from a central transformer rather than one long daisy chain. Add up the wattage of every fitting on a transformer and stay comfortably below its rating.

For connections, use gel-filled or resin joints, or proper IP68 junction boxes, and place them above ground wherever possible. A drip loop — a small downward loop of cable before it enters a connector — costs nothing and prevents a surprising amount of water ingress.

Planning the Layout Before You Buy

Sketch the garden on paper and mark three things: where people walk after dark, what you actually want to look at, and where the power already is. Then decide on at least two switched circuits, one for paths and one for planting or features, so you can leave the ornamental lighting off on an ordinary Tuesday.

Resist the urge to light everything. Contrast is what makes a garden look alive at night; a corner left in shadow gives the lit areas shape. Aim every fitting so you see the effect and not the source, and if a lamp catches your eye from the kitchen window, hood it, tilt it, or move it.

A Beginner's Buying Checklist

1. Decide voltage first: 12V for a safe, zone-based system you can extend yourself; 230V for long runs and a certified installation by an electrician.
2. Set a minimum IP65 for anything exposed, IP67 for in-ground, IP68 only for water features.
3. Check the body material and the cable gland, not just the housing colour.
4. Fix one colour temperature for the whole garden and stick to it.
5. Buy one or two fixtures first, wire them up on a temporary run, and look at them after dark before committing to twelve.

Get those basics right and the rest is interpretation: a bit of adjusting, a few fittings moved a metre, a shrub pruned back off a lens. The specifications exist to get you to that point without callbacks, and once they are second nature you can spend your attention where it belongs, on how the garden looks at nine in the evening.

Photo: Maxim Titov / Pexels