Landscape Lighting Guide: Planning, Placement, and Installation

Updated April 2026 · By the LandscapeCalcs Team

Landscape lighting transforms your property after dark — highlighting architectural features, illuminating pathways for safety, and creating outdoor living spaces that are usable well into the evening. A well-designed lighting plan uses a mix of techniques (uplighting, downlighting, path lighting, accent lighting) to create depth and drama without the parking-lot effect of too-bright, evenly distributed fixtures. This guide covers the lighting techniques professionals use, how to plan your layout, and the practical considerations of low-voltage installation.

Lighting Techniques and Fixture Types

Uplighting places fixtures at ground level aimed upward to illuminate trees, walls, and architectural features. It creates dramatic shadows and highlights texture. Downlighting (also called moonlighting) places fixtures high in trees or on structures aimed downward, creating soft, natural-looking illumination that mimics moonlight filtering through branches.

Path lights are low fixtures (12 to 24 inches tall) that illuminate walkways and garden borders. They should be spaced 6 to 8 feet apart in a staggered pattern on alternating sides of the path. Spotlights provide focused, directional light for accent features. Wash lights provide broad, even illumination for walls, hedges, and wide landscape features.

• Uplights: trees, architectural features, sculptures
• Downlights: patios, seating areas, natural ambiance
• Path lights: walkways, driveways, garden borders
• Spotlights: focal points, specimen plants, water features
• Wash lights: walls, hedges, retaining walls, wide features
• Step lights: stairs, deck steps, grade changes

Planning Your Lighting Layout

Start by identifying what you want to illuminate: safety areas (paths, steps, driveways), architectural features (the front of the house, columns, stonework), landscape features (specimen trees, garden beds, water features), and living spaces (patios, outdoor kitchens, seating areas). Prioritize safety lighting first, then accent lighting.

Walk your property after dark with a flashlight to test placements. Shine the light from different angles to see which creates the best effect on each feature. Mark fixture locations with small flags or stakes. A common mistake is over-lighting — less is more in landscape lighting. Dark areas between lit features create depth and contrast that make the lit areas more dramatic.

Low-Voltage Systems Explained

Residential landscape lighting uses low-voltage (12V) systems powered by a transformer that steps household 120V current down to a safe 12V. Low-voltage systems are safe for DIY installation — no electrician required for the outdoor portion. The transformer plugs into an outdoor GFCI outlet and connects to burial-rated cable that runs to each fixture.

Size your transformer at 80 percent capacity. Add up the total wattage of all fixtures and choose a transformer rated 20 to 25 percent higher. If your fixtures total 200 watts, use a 250 to 300 watt transformer. This headroom prevents overloading and allows for future fixture additions. LED fixtures draw a fraction of the wattage of halogen, so a 300-watt transformer can power 20 to 30 LED fixtures easily.

Installation Basics

Bury low-voltage cable 3 to 6 inches deep in a narrow trench along the lighting route. Use direct-burial rated 12-gauge or 10-gauge cable — 12-gauge is sufficient for runs up to 100 feet with modest fixture loads, while 10-gauge handles longer runs and heavier loads with less voltage drop. Connect fixtures to the cable using waterproof wire connectors.

Voltage drop is the main technical challenge. As current travels through cable, voltage decreases with distance. Fixtures at the end of a long run may receive only 10V instead of 12V, making them noticeably dimmer. Combat voltage drop by using heavier gauge wire for long runs, using a hub-and-spoke layout instead of daisy-chaining all fixtures in a single line, and keeping individual cable runs under 100 feet.