10 Things about LED lighting

Apr 19th, 2012 | Posted by | Filed under LED Light

Light emitting diodes, or LEDs, are becoming increasingly popular and more high-quality LED lighting products are being manufactured and sold in the marketplace.  LED lighting is an attractive alternative to incandescent or fluorescent lighting in both residential and commercial lighting applications because they are very energy-efficient, have very long lives, are very small in size, do not have any re-strike time, can be dimmable, generate relatively little heat, have a slow failure rate, are shock resistant, work well in low temperatures, their light can be easily focused, and they contain no toxic mercury unlike today’s popular energy-efficient lighting product, the compact fluorescent light bulb (CFL).  Here are 10 things that you should know about this newly-emerging light source.

1.    LEDs can be red, green, blue, or amber.  The color emitted by an LED is dependent upon the materials used to produce it.  For example, a red LED is made from the chemical elements of aluminum, gallium, and arsenic.  White LEDs are created by covering a blue LED with a yellow phosphorous coating.  A white LED can also be created by using a red, blue, and green LED in close proximity to each other.  At this time, there is not an LED that can emit white light.  Producing an LED that could emit white light is the “holy grail” of LED light research.

2.   LED Brightness A single high power LED can produce about 80 lumens of light.  In comparison, a standard 60 watt incandescent light bulb produces about 900 lumens.  Thus, a single high power LED is only about 1/11th as bright as a 60 watt incandescent light bulb.  In order to produce adequate lighting, therefore, an LED fixture must contain groups of LEDs.  However, the future is bright, pun intended, for LEDs.  The lumen output of LEDs has almost doubled in the last two years.

3.    Color temperature is a measure of the color appearance of a light source which helps describe the apparent “warmth” (reddish) or “coolness” (bluish) of that light.  Light sources below 3200 Kelvin (3200K) are considered to be “warm;” while those above 4000K are considered to be “cool” light sources.  For comparison, a traditional household incandescent light bulb is 2800K.  The color temperature of a light source is not related to how hot the light source will get or how much heat is given off by the light.  White LEDs vary in color temperature.  Some white LEDs can be as “warm” in appearance as 2600K but most white LEDs are slightly “cool” in appearance.  This is because most white LEDs are created by putting yellow phosphors over blue LEDs.

4.    Color rendering index (CRI) is the ability for any light source to render colors accurately.  The CRI scale goes from 1 (low pressure sodium) to 100 (the sun).  A CRI of 75 is considered to be good, a CRI of 85 is considered to be very good, a CRI of 95 is considered to be excellent, and, of course, a CRI of 100 is considered perfect.  LEDs in a warm white color temperature are currently available with a CRI of 80.

5.    As with all light sources, the efficacy of LEDs is measured in lumens/watt, the amount of light produced by one unit of power.  Warm white LEDs produce between 25-44 lumens/watt while cool white LEDs are more efficacious by producing 47-64 lumens/watt.  In comparison, the typical household incandescent light bulb creates 10-18 lumens/watt while compact fluorescent light bulbs produce 35-60 lumens/watt.

6.    LED Drivers Fluorescent light bulbs require a ballast in order to function.  The ballast provides a starting voltage and limits the electrical current to the light bulb.  LEDs also require a similar electronic power source.  For LEDs, this electronic power source is usually called an LED driver.  The LED driver converts line power to the appropriate voltage (usually between two and four volts DC for high-brightness LEDs) and current (typically 200-1000 milliamps or mA), and may also include dimming and/or color correction controls.  LED drivers are generally about 85% efficient.  Thus, the efficacy of LEDs should be reduced by 15% to account for the LED driver.

7. LED Heat era It is frequently a myth that LEDs do not create heat. In fact, all brightness resources create heat and LED lights are no different. Thus, it is vital that an LED fixture is well-designed with “heat sinks” to adequately dissipate the heat that is created.

8. LED Lifespan LEDs do not burn up out like an incandescent brightness bulb. instead they get progressively dimmer greater than their lifetime right up until they no extended emit adequate brightness getting useful. An LED is frequently regarded as getting no extended beneficial when it is emitting only 70% belonging toward genuine quantity of brightness the . The time that this requires is frequently referred to since the “rated life” of an LED. even although some LEDs may possibly possess a rated existence of 100,000 hours, that is frequently only below perfect laboratory conditions. below real-world ailments most LEDs operating in brightness fixtures may last as drastically as 60,000 hours. The rated existence of an LED is frequently drastically much less once the LED is operating within of a brightness fixture as opposed toward comparable LED operating outside of the brightness fixture because of toward buildup of heat inside the fixture. The common LED within of the common brightness fixture may possibly possess a rated existence of 35,000 to 60,000 hours.

9. OLED An OLED can be an all natural brightness emitting diode. it may be an LED that also consists of carbon. OLEDs are usually produced as versatile lightweight sheets. Today, OLEDs work at drastically reduced overall performance than inorganic (crystalline) LEDs. OLEDs usually create much less brightness every place than inorganic, stable think LEDs, that are usually produced for use as point-light sources.

10. Infrared and ultraviolet Radiation whitened LEDs do not emit infrared, or heat, radiation like an incandescent brightness bulb. In addition, whitened LEDs do not create ultraviolet radiation (UV rays) like a fluorescent brightness bulb.

Although there is becoming lots of advertising thought offered to LEDs, there are even now much as well a massive amount of LEDs which have been completely not well-designed. In short, the LED lighting industry is even now maturing. evaluation goes on to enhance LED brightness, efficacy, as well as the rated existence of LEDs at a remarkable pace. However, using the short-term be cautious when choosing an LED lighting fixture.

This article, “LED Lighting: 10 stuff to Know,” 1st arrived out inside the Pegasus Associates Lighting website.

7. LED Heat era It is frequently a myth that LEDs do not create heat. In fact, all brightness resources create heat and LED lights are no different. Thus, it is vital that an LED fixture is well-designed with “heat sinks” to adequately dissipate the heat that is created.

8. LED Lifespan LEDs do not burn up out like an incandescent brightness bulb. instead they get progressively dimmer greater than their lifetime right up until they no extended emit adequate brightness getting useful. An LED is frequently regarded as getting no extended beneficial when it is emitting only 70% belonging toward genuine quantity of brightness the LED produced. The time that this requires is frequently referred to since the “rated life” of an LED. even although some LEDs may possibly possess a rated existence of 100,000 hours, that is frequently only below perfect laboratory conditions. below real-world ailments most LEDs operating in brightness fixtures may last as drastically as 60,000 hours. The rated existence of an LED is frequently drastically much less once the LED is operating within of a brightness fixture as opposed toward comparable LED operating outside of the brightness fixture because of toward buildup of heat inside the fixture. The common LED within of the common brightness fixture may possibly possess a rated existence of 35,000 to 60,000 hours.

9. OLED An OLED can be an all natural brightness emitting diode. it may be an LED that also consists of carbon. OLEDs are usually produced as versatile lightweight sheets. Today, OLEDs work at drastically reduced overall performance than inorganic (crystalline) LEDs. OLEDs usually create much less brightness every place than inorganic, stable think LEDs, that are usually produced for use as point-light sources.

10. Infrared and ultraviolet Radiation whitened LEDs do not emit infrared, or heat, radiation like an incandescent brightness bulb. In addition, whitened LEDs do not create ultraviolet radiation (UV rays) like a fluorescent brightness bulb.

Although there is becoming lots of advertising thought offered to LEDs, there are even now much as well a massive amount of LEDs which have been completely not well-designed. In short, the LED lighting industry is even now maturing. evaluation goes on to enhance LED brightness, efficacy, as well as the rated existence of LEDs at a remarkable pace. However, using the short-term be cautious when choosing an LED lighting fixture.

This article, “LED Lighting: 10 stuff to Know,” 1st arrived out inside the Pegasus Associates Lighting website.