Incandescent Christmas lights are a type of light bulb that is often used to decorate homes and trees during the holiday season. They are characterized by their warm, yellowish glow and their vintage-style appearance. They are often referred to as "vintage" or "old-fashioned" Christmas lights because they were popular in the past, and they have a nostalgic, retro vibe. Incandescent Christmas lights are still widely used today because they are relatively inexpensive and easy to install, and they have a classic look that is beloved by many people.