Light-emitting diode (LED) technology is relatively high efficiency (higher lumens per watt), secondary optics (better lens/reflector), and greater heat dissipation compared to conventional incandescent lamps. Rapidly revolutionizing the electrical lighting industry. Let's take a look at some related content.
The rapid development of LED lighting technology and the associated cost reduction have made LED an increasingly viable lighting Solution. Today's LED lamps have higher energy efficiency than traditional incandescent lamps; because they waste less energy in the form of heat, they are 6 to 7 times more efficient than incandescent lamps and typically reduce energy consumption by 80%. the above. Higher reliability and longer life are other important advantages of LED luminaires. However, in order to meet the expectations of higher reliability and longer life, these luminaires must be properly protected from electrical hazards. LEDs can last up to 25 times longer than conventional bulbs if they are properly protected against overvoltage and other disturbances.
LEDs are widely used in a variety of applications due to their unique characteristics, including compact size, ease of maintenance, resistance to breakage, and the ability to focus light in a single direction. LED luminaires are widely used in road lighting, garage lighting, wall washers, traffic lighting, floodlighting, digital signage, tunnel lighting and street lighting.
Approximately one-third of the energy savings that LED lighting can achieve are the result of longer LED lamp life. Reducing maintenance costs is critical to ensuring the long-term cost-effectiveness of LED devices.
Outdoor luminaires that are not properly protected can fail at any time, even by reducing electricity bills before and after. Given that government agencies and property owners pay up to two to four times the price of replacing traditional lighting fixtures with LED luminaires, they need to recoup their investment, but if the LED luminaires are damaged by power line voltage transients during the specified lifetime This is impossible to talk about. Once the LED lighting is damaged, it must be repaired by the contractor or streetlight owner. Maintaining LED outdoor lighting is more expensive than initial installation, so the longer the product is used, the greater the chance of recovering the initial investment by conserving power.
To protect outdoor LED lighting from failure during the investment recovery period of approximately five to seven years, they must be highly durable and reliable. Transient surges in AC power lines can damage lighting and are a major threat to outdoor LED lighting. Whether it is traditional lighting or other lighting, there is no problem with no lighting. Some of the causes, such as weather or line voltage spikes and fluctuations, are far beyond the reach of the installation owner or product manufacturer.
GATEWAY programThe US Department of Energy's (DOE) GATEWAY program has received a series of important observations and results from its lighting assessment program. The program supports the evaluation and demonstration of high-performance solid-state lighting (SSL) products to gain empirical data and experience in this advanced lighting technology field application. DOE's GATEWAY program focuses on independent third-party data sources that provide decision-making for lighting users and professionals; these data should be considered in conjunction with other information relevant to the specific site and application under test. Each GATEWAY assessment compares the SSL product to the existing technology used at the site. Depending on the information and environment available, SSL products can also be compared to other lighting technologies. While the products used in the GATEWAY program may have been pre-screened for performance, DOE does not warrant any commercial products, or in any way warrants that users will achieve the same results.
DOE Study on LED Lifetime - I-35 Experiment on the BridgeThe I-35W Bridge in Minneapolis is still one of the oldest outdoor LED installations in the United States. The DOE released a report on the long-term performance of LED lighting systems installed on the bridge in September 2008. The report is a welcome addition to the LED lighting literature and will benefit from additional data on long-term field performance.
A recent DOE study on LED luminance decay over time expects a 30% lumen loss during LED device lifetime. During the 6-year test period, 2 of the 20 tested LED drive power supplies failed. Outdoor LED lighting is susceptible to a variety of environmental stresses, including wide range of temperature fluctuations, pollution and corrosion, rain and moisture, sunlight/ultraviolet radiation, wind and vibration, and power fluctuations. Transient voltages in the power line pose a significant threat to lamp reliability. Even without conclusive evidence of a field LED driver power failure, the DOE report indicates. At least some LED drive power failures are caused by insufficient surge protection.
As more and more field experience is gained, and the causes and effects of various other factors are better documented, the specification process at a particular location must be adjusted accordingly. One example is the suitability of the luminaire to meet local conditions. The luminaires on the I-35W Bridge were installed before the regulators enjoyed the benefits of years of experience in outdoor LED field experience. This means that these devices may encounter other preventable problems, such as measuring the reduction in lamp power and optical output, or even the two LED drive power sources that leave a fault record. Without knowing the cause of these problems, it is impossible to assert, for example, whether a higher level of surge protection can be used to face local voltage transients and to avoid such failures. Over time, more detailed specifications have emerged, not only meeting the needs of specific locations, but also reducing or even eliminating the thorny issues that have adverse effects on lighting performance.
in conclusionLED luminaires represent the early state of LED lighting technology, but they continue to show relatively reliable performance compared to conventional lighting fixtures. Up to now, about 20,000 hours of cumulative operation, if the lighting designer chooses the traditional lighting route, then the bridge will need at least one complete lamp replacement and an additional early failure, because this is any ordinary light bulb technology. Typical problem. DOE's six-year test and study of LED streetlights from the I-35W Bridge in Minneapolis from 2008 to 2015 demonstrates that LED luminaires always have a high return on investment. Higher levels of surge protection further minimize LED drive power failure and increase reliability. All outdoor LED lighting fixtures manufactured after 2015 must meet American National Standards Institute (ANSI) standards to achieve maximum life of LED fixtures.
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