Metal halide lights are high-intensity discharge lamps, a class of high-drain, high-output lighting. They are widely used in amenity lighting applications. A typical metal halide 250-watt light offers 58 mean lumens per watt output. Seventy-watt metal halide bulbs offer a mean lumen output of 45. Well-maintained metal halide light bulbs can endure over 15,000 hours of regular use.
Sodium lights are also a type of high-intensity discharge lamp that is ideal for amenity lighting. High-pressure sodium lights offer a lower output per watt than low-pressure lights. However, they tend to last longer than low-pressure sodium lights. Sodium lights are ideal for providing light for town centers or other places of leisure because they offer excellent color rendering. A 250-watt sodium light offers 87 mean lumen output per watt while a 70-watt sodium light offers a 64 mean lumen output per watt. A high-pressure sodium light bulb can last for well over 24,000 hours of regular use.
Fluorescent lights are some of the most efficient lights available to consumers. They are rated to last for over 10,000 hours and can easily be grouped together, increasing amenity lighting applications. Compact fluorescent bulbs offer the same output as fluorescent tubes of similar wattage in a more compact form, making them ideal for amenity lighting. Fluorescent bulbs use up to 75 percent less energy per watt than incandescent bulbs.
Incandescent lighting employs some of the oldest electric lighting techniques in history, but they are inefficient. The electric current drawn through a bulb's tungsten filament emits visible light. Several 100-watt incandescent bulbs can be joined together, providing enough light output for amenity lighting applications. A 100-watt incandescent bulb offers a rated life of approximately 750 hours. Incandescent bulbs offer around 17.5 lumens per watt efficiency.