There are two main types of street lighting:
High-pressure sodium (HPS) – HPS is a gas-discharge type of lighting that provides a yellowish-orange or orange colour light. It was the first type of street light to be widely used and remains the most commonly used form of street lighting today. It is cheaper to install and operate than other street lights, but it also has drawbacks, including the tendency to produce more glare than other types and a shorter lifespan.
Metal halide (MH) – MH lights are an improvement over HPS, producing a whiter light with less glare and longer life spans. They also tend to cost more than HPS lights.
Light-emitting diodes (LEDs) – LEDs produce white light when illuminated by electricity. Although they tend to cost more upfront, they last longer than both MH and HPS lights. LEDs also consume less energy than other forms of street lighting.