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Designing a Landscape Lighting System

by Guest Post on Apr 29, 2012

Before deciding what and how to light, we must first ask "Why light?" Our design decisions are dependent on proposed uses for landscape lighting...for safety, security, property value, or enhancement of the beauty of the garden and structures. Most likely, the answer will be a combination of two or more of these uses. a specific technique can be employed to satisfy more than one requirement...for example, uplighting a prominent tree near the house entrance will provide safety, security, and aesthetic enhancement.

Landscape lighting design is very similar to the design of the landscape itself: we must determine focal points, use areas, traffic patterns, outdoor "rooms," style, mood, etc. We need to consider how the proposed lighting will enhance the form, color, and texture of the soft and hard landscape elements. Lighting should serve to unify both interior and exterior design themes, conceal what may be unattractive, and shape the view of the landscape at night.

The design process should begin with a site map, drawn to scale, showing all landscape features and areas that need lighting. Fixtures and lamps are chosen for each area based on the desired effects ...path lights for safe passage along walks and stairs, wash fixtures for silhouette effects against a wall, etc.

One common mistake is to overlight; low levels of light create subtle beauty and are often also sufficient for safety and security. Use brighter lighting effects for focal points, and consider the effects that different light intensities will have on the overall design.

after deciding on the size and placement of lighting fixtures, the electrical system is designed. The heart of the system is the transformer, which converts the household 120 volts into safe, efficient 12 volts, and delivers this voltage to several circuits. Using appropriately sized cables and approved connectors, fixtures are connected to the transformer.

Group fixtures in zones are determined by the distance to the transformer. The number of fixtures on each circuit will be limited by the wattage of individual lamps, distance to the transformer, and associated voltage drop in the circuit.

Voltage drop calculations are critical; excess voltage results in hot lamps with greatly shortened life - insufficient voltage results in weak, ineffective lighting. The design challenge is to match cable size, total lamp wattage, and circuit length to produce voltage within the range of 10.5 to 12 volts. a new generation of transformers uses a multi-tap configuration to provide voltages over 12 volts for those zones at a sufficient distance from the transformer. (The excess voltage is reduced by the length of run to the first fixture). This allows greater design freedom and efficiency

a common practice among lighting designers and installers is to allow for plenty of movement of the fixture locations. By leaving extra cable at each fixture, changes can be made to the system after installation, and after several years of plant growth.

This has been a very brief introduction to the world of landscape lighting. There's a vast amount of additional knowledge available for the homeowner to consider, whether he or she wishes to design and/or install a home lighting system, or merely to learn more about the possibilities. The following are highly recommended sources:

The following are highly recommended sources: The Landscape Lighting Book by Janet Lennox Moyer...both available from online and offline sources.

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