Georgia Power's Outdoor Lighting team members are the "Outdoor Lighting Experts" in Georgia.
In addition to our many years of experience providing quality, affordable outdoor lighting to customers throughout the state – and tens of thousands of lights installed and maintained – we are members of, and participate in, many lighting-industry organizations. Our leadership roles in many of these organizations enable us to stay on the cutting edge of outdoor lighting technology and, lighting-industry trends, products, procedures, legislation, ordinances and regulations.
- Georgia Power Position Statement on Light Pollution
- Georgia Power Position Statement on Light Emitting Diode (LED) Outdoor Lighting Systems
Listed below are links to information and resources to help broaden your knowledge of outdoor lighting and related issues and topics.
HID or High-Intensity Discharge is a general term used to designate four different types of lamps commonly used for outdoor lighting: mercury vapor, low-pressure sodium, high-pressure sodium and metal halide. HID lamps require a warm-up period to reach full light output. A momentary loss of power can cause the HID fixture to re-strike and have to warm up again – a process that can take up to 15 minutes.
- Mercury Vapor (MV) lamps, in use since the late 1940s, produce a distinctive bluish-green light and provide poor color rendition. MV light output gets steadily dimmer with age while using the same amount of energy. The mercury vapor lamp is considered obsolete by today's standards. The Energy Policy Act of 2005 banned the production, import and sale of mercury vapor ballasts and fixtures effective January 1, 2008.
- Low-Pressure Sodium (LPS) lamps release a monochromatic yellow light and provide poor color rendition. As LPS lamps age, they start to use substantial amounts of energy but continue to provide the same amount of light. LPS is not widely used in street and area lighting applications.
- High-Pressure Sodium (HPS) lamps, first used around 1970, are the dominant type of HID light source in use on American roads. HPS produces an amber-white light, but they provide poor color rendering, meaning that colors cannot be differentiated. HPS lamps are a very efficient light source and have a relatively long and reliable life span.
- Metal Halide (MH) lamps produce an intense white light and provide very good color rendition. MH lamps provide a high efficacy (lumens per watt) and moderately long bulb life (up to 15,000 hours). MH is widely used for area lighting of commercial, industrial and public spaces such as parking lots and for security lighting.
Induction lighting systems are electrode-less and are very similar to conventional fluorescent lighting systems. Induction lighting systems are composed of an electronic ballast (used to generate a high-frequency electronic current), a lamp or discharge vessel (filled with a mixture of gases, including mercury), and a power coupler (an induction coil to convert the high-frequency electronic current into a magnetic field within the discharge vessel). Induction outdoor lighting systems are energy-efficient when compared to mercury vapor, but not when compared to HPS, and provide white light with good color rendering (80+ CRI), quick ignition and re-ignition, and a rated life of up to 100,000 hours. Photometric performance does not compare well to HPS for outdoor lighting applications.
LED or Light-Emitting Diode technology is rapidly becoming competitive with high-intensity discharge light sources for outdoor lighting applications.Well-designed LED outdoor lighting luminaires can provide the required surface illuminance using less energy and with improved uniformity compared to HID light sources. LED luminaires may also have significantly longer life (50,000 hours or more) with better lumen maintenance. Other advantages of LED include that they contain no mercury, lead or other known disposal hazards and they come on instantly without a warm-up or re-strike delay. LED technology is improving rapidly in areas of efficacy, color quality, optical design, heat management and cost, and is compatible with dimming and controls systems.
LEP or Light-Emitting Plasma technology is an emerging light source and a possible choice for high-lumen outdoor lighting applications. The LEP system consists of an emitter, driver and power supply. LEP is a category of solid-state lighting but is not an LED. With LEP, a solid-state device is used to generate radio frequency energy which powers a plasma light source (quartz capsule embedded in a ceramic puck). Light emitting plasma technology promises high-lumen output, good color rendering, long life, energy efficiency, reduced maintenance requirements, and compatibility with dimming and controls systems.