OptiCore Christmas lights offer the ultimate in durability and beauty. The polycarbonate bulbs are unbreakable, 200 times stronger than glass. The thick bulb walls enable brilliant color and a glow that looks more like old-fashioned incandescent Christmas lights. Yet these lights are long-lasting, energy efficient LEDs, just 0.84 watts per bulb. Plus they��re dimmable. Try OptiCore Christmas lights, and you��ll see why they��ve become a favorite of professional installers and Christmas light enthusiasts everywhere.