Which of the following is considered the biggest advantage of sodium vapor lamps?

Sodium vapor lamps are well-known for their efficiency, which is one of the most significant advantages they offer. They provide a high luminous efficacy, meaning they produce a substantial amount of light for the amount of electrical energy consumed. This efficiency is crucial in many applications, particularly in street lighting and outdoor spaces, where energy cost savings can have a substantial impact over time.

The operating principle of sodium vapor lamps involves the excitation of sodium gas, which emits light when it returns to its ground state. As a result, these lamps can generate a bright, intense light while consuming less energy compared to other types of light sources, such as incandescent or halogen lamps.

While other aspects such as durability and cost-effectiveness are also favorable characteristics of sodium vapor lamps, efficiency stands out as the primary advantage. This means they contribute to lower electricity bills and reduced energy consumption, which is increasingly important for sustainability and cost management in urban infrastructure and other lighting applications.