LEDs (or light emitting diodes) are solid state, semiconductor light sources. Light is produced when electrons pass through a semiconductor material. Current commercial LED light fixtures are about as efficient as compact fluorescents (CFLs). However, LED lighting is a relatively new commercial lighting technology that is in a constant state of development. There is hope that with continued research and development, LED light sources will surpass fluorescent light sources in terms of cost, efficiency and overall utility. The United State's Department of Energy (DOE) estimates that over the next 20 years LEDs may be able to: Save approximately $265 billion, offset the construction of 40 new power plants and reduce demand associated with lighting by 33%. CLICK HERE to visit the DOE's Energy Star website to learn more about LEDs.
There are many benefits associated with LED light sources. Current LEDs are expected to have a life of roughly 50,000 hours, which is roughly five times as long as current CFLs. LEDs don't fail at the end of their usable life, they gradually become dimmer--something referred to as lumen depreciation. LED end of life is usually determined at a 30% reduction in light output. LEDs have other benefits not related to longevity. LEDs do not contain mercury, they produce light directionally and new LED fixtures have the ability to dim from 0% to 100%.
Currently a few drawbacks prohibit the widespread use of LED light sources. Perhaps the largest barrier is the upfront cost. However, like CFLs, their long life leads to energy savings in the long run, as well as a lower cost of maintenance (replacements) over time. Another current issue is associated with heat. LED technologies loose efficacy and longevity if over-exposed to heat, causing some LEDs to face compatibility issues with current fixtures. LEDs fit into current fixtures, but the fixtures weren't manufactured to operate with an LED heat sink to quickly and efficiently disperse heat waste. It is recommended that consumers currently purchase new fixtures designed for use with LED technologies.
LEDs range in quality. It is important that when buying an LED the consumer looks for the Energy Star label. This will ensure that the product has been tested for lumen depreciation, color quality, efficiency, instant on, color rendering and dimming capabilities. The DOE's Commercially Available LED Product Evaluation and Reporting (CALiPER) program tests a wide variety of solid state technologies available for general use. CLICK HERE to visit the DOE CALiPER homepage to learn more. LED fixtures can often cost several times the amount of an equivalent fixture of a more traditional light source.
For more information about LEDs use the links below:
