Conversion of Streetlights to Light-emitting Diode (LED) Type

Due to the increasing need for energy conservation and improved outdoor experience, current streetlights require an upgrade to light emitting diode (LED) lighting. LEDs are well known for their better operating hours, brighter color temperature, and reduced energy consumption. According to the U.S. Energy Information Administration, lighting accounts for 17% of the energy consumption of commercial buildings [1]. Approximately 1–3% of the total electricity consumption comes from public street lighting and highway lighting globally [2]. There are several challenges associated with this large-scale transformation from high-pressure sodium (HPS) to light-emitting diode (LED) lights, starting with inaccurate or less information on the existing inventory, correct ownership determination, education on the use of LEDs, and financing/funding issues. In this paper, a methodology was presented to overcome the challenges of LED transformation. As a sample case based on the existing profile of high-pressure sodium (HPS), incandescent (INC), fluorescent (FL), metal halide (MH), and mercury vapor (MV) in the District of Columbia, energy conservation from the conversion of HPS to LED type was presented. Total energy savings and GHG reduction from this conversion yielded a positive outcome from large-scale replacements with LEDs. LED drivers are capable of withstand the stresses that streetlights are exposed to. However, additional considerations from a lighting equipment specifier to select drivers with more robust capacitors withstanding high heat and frequencies are needed. A simple evaluation of HPSs vs LEDs showed greater performance for lower-rated LED wattage luminaires.