The Transformer 15E60BK from Kichler provides the best options and flexibility needed for most installations. Output voltage will suit most jobs. The Kichler Black Landscaspe 15E60BK Economy Series 60-Watt Transformer is an economical choice for small jobs or single specialty piece applications. The Economy Series Transformers are available with a black polymeric enclosure which resists corrosion. This transformer has an easy connect terminal blocks, an on/off/auto switch, and an on/off switch. The 15E120BK is featured with an auto-resettable in-line primary overload protection, as well. There is a thermal cut-off on the primary side if the need arises, and a thermal reset breaker on the secondary side. Your transformer selection will depend on the lighting job; size of the design layout, watts required and length of runs. Voltage drop will result in your lamps decreasing in brightness the farther they are from the transformer. Keeping runs as short as possible will minimize voltage drop and maximize light output. Kichler Landscape Lighting Transformers feature epoxy encapsulation for greater protection and performance, secondary protection and auto-reset circuit breakers.