Landscape Contractor / Design Build Maintain

APR 2018

LC/DBM provides landscape contractors with Educational, Imaginative and Practical information about their business, their employees, their machines and their projects.

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Right To illuminate this fountain at a house in Omaha, Nebraska, McKay Landscape Lighting used Focus underwater lights with pivoting bases for precise aiming. In the basin, they installed four, five-watt fixtures with 40-degree beam spreads. The two bowls above the basin have two fix- tures each with four-watt lamps with 60-degree spreads. April 2018 25 without it being fully submerged." To ensure that the lighting is properly cooled, the best practice is to have it installed a minimum of 18" below the water's surface, according to the instal - lation manual for Hayward underwater lighting fixtures. In regards to wiring underwater fixed- in-place light apparatuses, a dry conduit should be run from behind the fixture to a low-voltage transformer that is at least 10 feet away from open water and 12 inches above grade. Also, keep in mind that if your area is prone to flooding, the trans - former may need to be installed higher. The conduit should not have any sharp turns because this could cause a splice in the wire and instead soft angles are ad - vised. For the ends of the conduit, the Landscape Lighting Guidelines, supplied by the Association of Outdoor Lighting Professionals (AOLP), recommends that "All conduit that is terminated outside of the water source should be located at a minimum level of 8 inches above the wa - ter level at the water feature." Installation of permanent mounted fixtures for a pool is difficult. Riverpool - sandspas.com relays that it takes major renovations to install pool lights into an existing pool. "We would suggest if you're remotely considering a pool light, it's best to have it installed during con - struction." Most local electrical codes re- quire that a licensed electrician perform any pool electrical work. Although the installation may be chal - lenging, maintenance on existing under- water mounted fixtures is relatively user- friendly. First of all, due to the permanent nature of these fixtures, life expectancies are usually on the high end, eliminating the need for frequent repairs. Low volt - age LED light bulbs, the most common underwater bulbs in use today according to poolcenter.com, have a life expectancy of around 50,000 hours; equating to 13.7 years of use at 10 hours a day. To replace a bulb, it typically requires loosening a single screw and pulling the fixture above the water's surface. Always take the utmost caution when handling mounted fixtures for any under - water application. Information found on sunplay.com states that there have been 60 pool electrocution fatalities in the U.S. between the years of 1990 and 2003 due to faulty wiring in pool lights. Moveable Uplights On the opposite side of the underwater lighting spectrum, are mov - able uplights. These are almost always Right The Atlantis 16 is part of Unique Lighting Systems' Odyssey series. The Atlantis 16 is made from machined brass and is designed to work in depths of up to 3 feet. This fixture uses a standard MR16 lamp and includes an in- tegrated 180-degree rotational swivel bracket. The best practice for this specific fixture, according to the product's specification sheet, is to place it in shallow water and aim it at an element that is above the water's surface.

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