What type of lamps are specified for outdoor lighting in the facility?

The specification of metal halide and high-pressure sodium lamps for outdoor lighting is based on their efficiency and performance characteristics that are well-suited for such applications. Metal halide lamps provide a high lumen output and a good color rendering index, making them ideal for illuminating large outdoor areas, such as parking lots and sports fields. They produce bright white light, which enhances visibility and safety during nighttime.

High-pressure sodium lamps, on the other hand, are known for their high efficiency and long life. They emit a warm yellow light and are often used in street lighting and other outdoor environments where energy consumption needs to be minimized. These lamps are particularly valued for their reliability and low maintenance costs, making them a practical choice for outdoor settings.

When considering alternatives, options like incandescent and fluorescent lamps are less suitable for outdoor use due to their lower efficiency and shorter operational lifespan compared to metal halide and high-pressure sodium. Incandescent lamps use more energy for less light output, and while fluorescent lamps can be efficient, they often struggle with performance in outdoor conditions, especially in lower temperatures.

LED and incandescent combinations, as well as halogen and LED, also do not provide the same high output and durability expected in outdoor lighting. Therefore, metal halide and high-pressure