What is the biggest disadvantage of sodium vapor lamps?

Sodium vapor lamps are commonly used for street lighting and other outdoor applications due to their high efficiency and long life. However, one of the most significant disadvantages of these lamps is indeed the color of light they produce. Sodium vapor lamps emit a very specific spectrum of yellow-orange light, which can distort color recognition and reduce visibility of certain objects in the environment. This can be particularly problematic for applications where accurate color differentiation is essential, such as in security or situations requiring clear visibility.

The monochromatic light can lead to challenges in safety and aesthetics, as the illumination does not provide the same visual clarity as other lighting options. Unlike daylight or full-spectrum light sources, the limited color range does not facilitate accurate perception of colors. Additionally, this can create an unappealing ambiance for areas where people want to feel safe and comfortable.

In contrast, while heat production, energy consumption, and cost of production are also factors to consider, they do not overshadow the impact of the color of the light itself on functionality and environment, making this the most prominent disadvantage of sodium vapor lamps.