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Cables used in installing landscape lighting is typically buried underground. The cable runs from the transformer to each light fixture to give them power.  Low Voltage electrical cable comes in several gauges (12, 14, 16 are the most common). The lower the gauge number is, the thicker the wire will be. Thicker wires have higher capacities for voltage.  Transformers usually have a recommended gauge of wire to use with their system based on the amount of power the transformer can tolerate. Check with the manufacturer of your specific transformer to determine which gauge to use. Low voltage lighting can include several different types of lighting. It is important to choose the type that works best for your project.  Accent fixtures are the smaller, less obvious types of lights that include floodlights, spotlights, etc. Usually, this type of lighting is used to illuminate trees, plants, flowerbeds, ponds, and other features in your landscape.  Pathway lighting (as the name implies) is designed to illuminate pathways. They are often more decorative than accent fixtures as they are designed to be seen. You can use them to line your driveway, to light up the walkway to your front door, or to shine some light on a pathway in your backyard. There are several different ways to design the way the cables run from the transformer to the fixtures. The design you choose depends on the outcome you want.  You can wire the lights in a straight run from the transformer. This means that there is a single length of wire running from the transformer to each of the lights in sequence. Another option is to wire the lights in a loop, with the wire returning to the transformer. This helps reduce the power dropping off at long distances from the transformer, which keeps distant lights from dimming. You can also install multiple straight runs from the same transformer. Keeping the lights closer to the transformer will help eliminate the voltage drop that occurs when lights are further away.
Consider what kind of electric cable to use. Choose your lights. Choose the design of your lighting method.