An LED street light is an integrated light that uses light emitting diodes (LED) as its light source. These are considered integrated lights because, in most cases, the luminaire and the fixture are not separate parts. In manufacturing, the LED light cluster is sealed on a panel and then assembled to the LED panel with a heat sink to become an integrated lighting fixture.
LEDs (light-emitting diodes) have been around since the 1960s. They are used as indicator lights in consumer products and—for the last few years—in traffic and pedestrian signals. Recently, however, they have become practical for general lighting purposes. Although they cost more upfront than the bulbs they replace, LED street light use less energy and last longer than conventional fixture, resulting in significant energy and maintenance savings. Led street light also produce directional light, which gives us more control over what we light (i.e. the street) and what we don't (the night sky), reducing light pollution and wasted energy.
How Does Led Street Light Work?
Different designs have been created that incorporate various types of LEDs into a light fixture. Either few high-power LEDs or many low-power LEDs may be used. The shape of the LED street light depends on several factors, including LED configuration, the heat sink used with the LEDs and aesthetic design preference. Heat sinks for LED street lights are similar in design to heat sinks used to cool other electronics such as computers. Heat sinks tend to have as many grooves as possible to facilitate the flow of hot air away from the LEDs. The area of heat exchange directly affects the lifespan of the LED street light.
The lifespan of an LED street light is determined by its light output compared to its original design specification. Once its brightness decreases by 30 percent, an LED street light is considered to be at the end of its life.
Most LED street lights have a lens on the LED panel, which is designed to cast its light in a rectangular pattern, an advantage compared to traditional street lights, which typically have a reflector on the back side of a high-pressure sodium lamp. In this case, much of the luminance of the light is lost and produces light pollution in the air and surrounding environment. Such street lights can also cause glare for drivers and pedestrians.
Light-emitting diodes (LEDs) are semiconductor devices that emit light when an electric current passes through them. They are designed for better control over the electrical current making them have low current, heat and voltage. This results in longer lifespan, lower maintenance costs and energy savings.
The lifespan of LED Streetlights is determined by its light output compared to its original design specification. Once its brightness decreases by 70%, an LED Street light is considered to be at the end of its life.
Advantages of LED street lamp
1) Low energy consumption: Many Led street lamp retrofits have been claimed to dramatically reduce energy use.
2) Long and predictable lifetime: The projected lifetime of LED street light is usually 10 to 15 years, two to four times the life of currently prevalent HPS. (LEDs themselves do not generally fail or "burn out" in a way comparable to other technologies, and barring catastrophic failure of other mechanical or electronic components of the LED fixture, lifetimes are typically set by a decrease in luminous output of 30%. But the functional lifetime of an LED fixture is limited by the weakest link; associated drive electronics are typically projected to last about 50,000 hrs. It is important to understand that no LED street lamp products have been in service long enough to confirm the projections.) If realized in practice, the less frequent need to service or replace LEDs will mean lower maintenance cost.
3) More accurate color rendering: The color rendering index is the ability of a light source to correctly reproduce the colors of the objects in comparison to an ideal light source. Improved color rendering makes it easier for drivers to recognize objects.
Quick turn on and off: Unlike fluorescent and high-intensity discharge (HID) lamps, such as mercury vapor, metal halide, and sodium vapor lamps, which take time to heat up once switched on, LEDs come on with full brightness instantly.
4) Immediate restart: Unlike mercury vapor, metal halide and sodium vapor lamps (commonly used in street lighting), LEDs do not have a problem restarting immediately (hot ignition) following a brief power failure or inadvertent turn off.
RoHS compliance: LEDs don't contain mercury or lead, and don't release poisonous gases if damaged.
5) Less attractive to nocturnal insects: Nocturnal insects are attracted to ultraviolet light emitted by many conventional light sources.
6) Optically efficient lighting equipment: Other types of street lights use a reflector to capture the light emitted upwards from the lamp. Even under the best of conditions, the reflector absorbs some of the light. Also for fluorescent lamps and other lamps with phosphor coated bulbs, the bulb itself absorbs some of the light directed back down by the reflector. The glass cover, called a refractor, helps project the light down on the street in a desired pattern but some light is wasted by being directed up to the sky (light pollution). LED Street lamp assemblies (panels) can send light in the desired directions without a reflector.
7) Reduced glare: Directing the light downward onto the roadway reduces the amount of light that is directed into driver's eyes.
8) Higher light output even at low temperatures: While fluorescent lights are comparably energy efficient, on average they tend to have lesser light output at winter temperatures.
More energy efficient providing energy savings
Longevity and decreased energy consumption offer significant maintenance savings
Control of light dispersion spreads light out evenly and reduces light pollution and light trespass
Reduces CO2 emissions
Conversion from the conventional street lighting to LED technology will result in power consumption reductions between 40% and 60% per light, depending on each particular manufacturer.
Light replacement is in line with the previous conversion to LED Traffic Signals in 2006. LED street light fixture lifetimes haven't been time tested. A schedule for upgrades and maintenance should be initiated to determine the actual life of the fixture. Overall, the positive benefits of LED Street Light fixture make them a focus as they become more advanced and cost-effective.
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