Aurio Lighting Pro Light String Set features 150 C5 LED Warm White bulbs. With 50-feet of industrial-grade material, it is much more durable then most light strings found on the market. The patented Continuous-On Technology revolutionized the industry and is still the most sought-after feature in decorative lighting today.  You can easily identify and replace any failed bulb, while the rest of the string stays lit.  Using advanced wiring techniques and circuitry, our lights shine bright with steady, flicker-free light.  The Aurio Pro Light String Set conforms to or exceed UL588 standards and have received CSAus Certification. This is a purchase you won't regret.