Christmas light buying guides from The Christmas Light Emporium, written to answer the questions that actually decide a purchase: C7 vs C9 bulbs, which lens style fits your project (5mm, M5, C6, or G12), warm white vs cool white, how many strings a roofline needs, and what separates professional-grade LED lights from retail-store strings — copper wire, single-molded bulbs, polycarbonate lenses, and high-output SMD chips. Every guide is built from our own product specs, so you can compare options and buy once, correctly.