The majority of streetlights in the Agency are High Pressure Sodium (HPS) streetlights. Though they are the most common streetlight technology in most cities in Southern California and across the U.S., HPS streetlights are not the most efficient. The light distribution is limited and much of the light generated is either lost or not directed to the desired location in the roadway. In addition, HPS streetlights cast an orange light which makes identifying color very difficult.