KICHLER LIGHTING Landscape Design Pro LED : Page 21
DESIGN PRO LED PATH & SPREAD | Low Voltage LED Lighting Installation Understanding the difference betweenWatts & VA Kichler Landscape LED drivers convert the 12V AC current to a DC current specified by the LED manufacturer. When electric power is converted from AC to DC, there are losses and changes to the electrical properties; these effects are known as the “Power Factor”. In an LED lighting installation it is necessary to use the VA value of a fixture in order to compute and select a trans- former with adequate power for the system. For your con- venience Kichler supplies the VA as well as the Wattage for each of the fixtures in our catalog. What does this mean to the system designer? There are two areas to consider: the load on the transform- er and Watts consumed according to the electric power company. The load on the transformer The “VA” (volts x amps) rating on Kichler Landscape prod- ucts represents the value used when calculating the total system load. This VA number will help you determine the correct size transformer for an LED installation. Example: Number of Fixtures x VA value = Transformer Requirement (8) Fixtures x 12.2VA ea. = 97.8VA 9.5¢ 15742 This LED system requires at least a 8.44¢ TheWatts consumed according to the power company When demonstrating the cost of ownership use the Watt rating of the LED fixture. This represents the actual electric consumption for which the homeowner Example: Number x Watts of Fixtures = Actual Electric Consumption (8) Fixture x 8.5 Watts ea. = 68 Watts 15742 8.5¢ per kilowatt hour 2002 year 2007 340W 340W LED fixtures consume approximately 75% less electricity than an incandescent of similar lumens. 80.2W 80.2W LED Energy & Cost Comparison ENERGY USE Average Installed System 340W 6 hrs/Day INCANDESCENT Type of Fixture LED COST OF ELECTRICITY 10.64¢ per kilowatt hour 10.5¢ The average cost of electricity rose 25% between 2002 and 2007 High Energy Efficiency: Create maximum impact on the landscape with minimum effect on the environment 75% less energy consumption than traditional incandescent/halogen fixtures • Long-term cost savings and superior long-life light source (40,000 hours) LANDSCAPELIGHTING.Com 21 Cost per kilowatt hour – US national average Watts Consumed
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