50 Watt, 12 Volt DC, 4.2 Amps Programmable Smart Power Supply includes a uniquely paired remote key fob, 4' output wire lead with molded Tee connector, and 5' wired remote photocell. Built in Smart Phone Connectivity, LED dimmer, timer (1-8 hours or dusk to dawn), teachable photo eye, and diagnostic troubleshooting modes. Android and IPhone apps available. Add up the total wattage of all the bulbs you will be using. This will give you an estimate of which size lighting transformer you will need. Will power approximately a maximum of 65 each (0.8 Watts) lights.