The 50-Light LED C3 Red Light Set from Martha Stewart Living will brighten your home for the holidays. There are 50 red C3 ice bulbs per set; connect up to 29 light sets (sold separately) for a large, eye-catching display, indoors or outdoors. Continuous-on technology prevents other bulbs in string from powering off should one bulb get loose or damaged. Long-lasting, energy-efficient LEDs. UL-listed.