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Choose the Right Transformer
 Single Tap AC Transformer |
Low voltage deck lighting uses a transformer plugged into a standard wall outlet to convert ordinary household power from 110 volts down to 12 volts. To determine the size of transformer needed, add up the total number of watts for each light fixture in your deck plan. Then, add another 10% for cables and connections that add hidden watts to your system. A simple equation to use is:
Total light watts x 1.1 = transformer size needed Choose the transformer that most closely matches your total lamp wattage, and round the number up rather than down. You may also want to leave some room to add more lights in the future. For example, 13 fixtures all rated at 20 watts will require a 300 watt transformer (13 x 20 = 260. 260 x 1.1 = 286). |
a full .pdf version of this lighting guide (4.50 MB) 
