C9 OptiCore Commercial LED Christmas String Lights (50 ct, 50 ft, White Wire). Legendary durability meets breathtaking beauty in the OptiCore line of Christmas lights from Wintergreen Lighting. OptiCore bulbs are made of polycarbonate, up to 200 times stronger than glass, so they’re virtually unbreakable. The bulbs are thicker too, so light penetrates the lens more evenly, creating vivid color distribution. The bulbs are paired with 18 gauge commercial grade stringer that features weep holes for trouble-free wet weather performance. And OptiCore string lights are so energy efficient you can connect up to 500 ft. Of lights end to end from a single power outlet. Long lasting too, with a 60,000-hour average life expectancy. And if you’re looking for an LED replacement for vintage- and ceramic-style Christmas lights, you owe it to yourself to see the OptiCore smooth bulbs in person. OptiCore’s even light distribution on that smooth surface glows with an evenness and rich color that you’ll swear must be old-fashioned ceramic Christmas lights. Tough enough to throw off a building, beautiful enough to make even seasoned Christmas light enthusiasts swoon. OptiCore bulbs are simply unlike any other Christmas lights on the market. So stop replacing cheap Christmas lights year after year. Make an investment in what may be the last Christmas lights you ever need: OptiCore. Owned and -based company with U. Set of 50 OptiCore C9 commercial grade polycarbonate Christmas lights, up to 200 times stronger than glass, practically unbreakable. Commercial grade 18 gauge 50 ft white stringer features sockets with weep holes for trouble-free wet weather performance. Average life expectancy: 60,000 hours. Thick polycarbonate lenses distribute the light evenly across the lens, for rich color and beautiful light. Energy efficient: connect up to 500 feet of lights together end to end from a single power outlet. Nickel plates bulb bases prevent corrosion and improve connectivity. Rated for indoor or outdoor use.