Networked outdoor lighting systems will be integrated with smart city initiatives, report finds. Outdoor lighting systems are a major contributor to global energy use. Today, this market segment is dominated by fluorescent, high-pressure sodium, and metal halide lamps. Over the next 10 years, however, LEDs will become the leading lamp type for outdoor installations. According to a new report from Navigant Research, worldwide shipments of luminaires with LED lamps for outdoor and parking applications will grow from 4.1 million annually in 2014 to nearly 14 million in 2023.