OptiCore smooth/opaque Christmas light bulbs recreate the rich color and warm beauty of vintage incandescent Christmas lights, but with all the advantages of LED. The opaque lens is 115% thicker than ordinary bulbs and made of polycarbonate, up to 200 times stronger than glass. This makes OptiCore bulbs virtually unbreakable. The SMD LED diode inside saturates the lens evenly with vibrant light, giving these bulbs that old-fashioned glow from any viewing angle. And with an average lifespan of 60,000 hours, these are bulbs that will last for years. Get the energy efficiency and durability of LED with all the richness and color of old-fashioned Christmas lights in these OptiCore LED smooth Christmas light bulbs, only from Wintergreen Lighting.