Convert Solar Christmas Lights To Electric . Finally, you can wire the solar light to the transformer. Make sure to attach black to black and white to white. Solar powered Twinkle Outdoor garden night Fairy String Waterproof Rope from www.ebay.com For another unusual and attractive take on string lights, the bolansi bubble crystal ball light strings offer larger, brighter, enchanting lights that are perfect. \$\begingroup\$ the thing is that something bright enough to light them all from the middle will need a lot of power, which means a large battery pack. Top 5 solar christmas lights.