Neon lights have several unique and special features that make them stand out:

1. Distinctive Color and Glow: Neon lights are known for their vibrant and distinctive colors. Depending on the gas used, they can produce a wide range of colors, from the classic red-orange glow of pure neon gas to the bright blues and greens achievable with argon and mercury mixtures. These colors have a soft, warm glow that is unlike any other type of lighting.

2. Retro Charm: Neon lights have a timeless, retro charm that has made them iconic symbols of cities and businesses around the world. They evoke a sense of nostalgia and can add a touch of vintage style to any setting.

3. Durability: Neon lights are incredibly durable and can last for many years with proper maintenance. The glass tubes are designed to withstand high temperatures and pressures, making them suitable for both indoor and outdoor use.

4. Visibility: Neon lights are highly visible, even in daylight or from a distance. This makes them ideal for advertising and signage, as they can easily catch the eye of passersby.

5. Customizable: While traditional neon signs often feature simple text or shapes, modern neon lighting technology allows for greater customization. With computer-aided design (CAD) and digital fabrication techniques, it's possible to create complex, intricate designs that incorporate multiple colors and patterns.

6. Eco-friendly: Although traditional neon lights consume more energy than modern LED lights, they are still considered relatively eco-friendly. They don't contain mercury like some other types of lighting, and their long lifespan means fewer replacements are needed over time.

7. Atmospheric Effect: Neon lights create a unique and atmospheric effect that can enhance the ambiance of a space. Whether it's a dimly lit bar or a bustling city street, neon lights add a touch of excitement and energy to the environment.

Overall, neon lights are special because of their distinctive colors, durability, visibility, customizability, eco-friendliness, and ability to create a unique atmosphere. They have been a staple of advertising and signage for decades and continue to be popular today.