It comes with 2 spare lights, its system allows that, if a bulb is off, the rest remain on. It consumes 1 watt per bulb, using a total 24 watt per installation, achieving a 90% saving in energy consumption. It can be easily connected to other devices due to its outlet at the end of the cable. Made of 11% PVC for cable, 4% plastic/silicone bulb holder body, 10 aluminum, 65% copper cord, 5% LED and 5% PCBA LED circuit. Made in China.