Shop professional-grade OptiCore C9 LED Christmas light bulbs built for demanding holiday lighting installations. Made with durable polycarbonate lenses that are up to 200 times stronger than glass, OptiCore C9 bulbs are virtually unbreakable and designed to deliver rich, even colour with their reflective-core LED design. Christmas Lights Canada supplies installers, decorators and businesses across Canada with OptiCore C9 bulbs, wholesale Christmas lights and professional Christmas light supplies.