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Lighting & Lamps
by Tomo ·
Lighting & Lamps
10 Things to Know about LED Lighting :
LED lighting is an attractive alternative to incandescent or fluorescent lighting in both residential and commercial applications of lighting because they are very energy efficient, have a very long life, are very small, no time re -strike, may be variable, producing relatively low heat, have a failure rate slow, are resistant to shocks, work well at low temperatures, their light can be easily carried, and they do not contain toxic mercury unlike popular Today’s lighting product energy-efficient, compact fluorescent bulbs (CFL). Here are 10 things you should know about this new source of light emerging.
1. Colored and white LEDs LED can be red, green, blue or amber. The color emitted by an LED depends on the materials used to produce it. For example, a red light is made from chemical elements aluminum, gallium and arsenic. LEDs are created by covering a blue LED with yellow coating and phosphorus. A white LED can also be created using a LED red, blue and green in close proximity to each other. At that time, there is not an LED that can emit white light. Produce an LED that can emit white light is the “Holy Grail” of research LED light.
2. LED Brightness single high power LED can produce about 80 lumens of light. In comparison, a standard 60-watt incandescent bulb produces about 900 lumens. Thus, a single high power LED is only about 1/11th as bright as an incandescent bulb of 60 watts. To produce adequate lighting, therefore, must contain an LED light groups of LEDs. However, the future is bright, pun, for LEDs. The LED light output has almost doubled over the past two years.
3. LED color temperature Color temperature is a measure of the color appearance of a light source that can describe the apparent “heat” (red) or cool (blue) in this light. Light sources below 3200 Kelvin (3200K) are considered “hot”, while above 4000K are considered cool light sources. By contrast, a traditional incandescent household light 2800K. The color temperature of a light source is not related to how warm light source to get it or how much heat is generated by light. White LEDs vary color temperature. Some white LEDs can be as “warm” in appearance than 2600K, but most white LEDs are a bit “cool” in appearance. That’s because most white LEDs are created by putting yellow phosphor blue LEDs.
4. LED color rendering color rendering index (CRI) is the ability for any light source to render colors accurately. The CRI scale ranges from 1 (low pressure sodium) to 100 (the sun). A CRI of 75 is considered good, a rating of 85 is considered very good, a rating of 95 is considered excellent, and, of course, a CRI of 100 is considered perfect. LEDs in warm white color temperature are currently available with a CRI of 80.
5. As with all effective LED light sources, the efficiency of LEDs is measured in lumens per watt, the amount of light produced by a unit of power. Warm white LEDs produce between 25-44 lumens / watt while cool white LEDs are more efficient in producing 47-64 lumens / watt. In comparison, the typical household incandescent light bulb creates 10-18 lumens / watt, while compact fluorescent bulbs produce 35-60 lumens / watt.
6. The fluorescent bulbs LED drivers require a ballast to operate. The ballast provides a starting voltage and limits the power of the bulb. LEDs also require a power source the same. For LEDs, this energy source is usually called an electronic LED driver. The LED driver converts the current line to the appropriate voltage (typically between two and four volts DC for high brightness LEDs) and current (generally 200-1000 milliamps or mA), and may also include dimming and / or control color correction. LED drivers are typically about 85% effective. Thus, the efficiency of LEDs should be reduced by 15% to reflect the LED driver.
7. LED Heat Generation is a myth that the LEDs do not generate heat. In fact, all light sources produce heat and LED lights are no different. Thus, it is important that LED lighting is designed with heat sinks “to properly dissipate the heat that is created.
8. LED LED lifetime are not burning like an incandescent bulb. Instead, they gradually become dimmer over their lives until they are no longer emit enough light to be useful. An LED is usually considered more useful when it emits only 70% of the initial amount of light the LED product. The time it takes is often called life “was described as” an LED. While some lights may have a design life of 100,000 hours, it is usually only in perfect laboratory conditions. In real world conditions over the status lights in the lighting fixtures can last up to 60,000 hours. The design life of an LED is often much less when the LED is operated in a fixture, as opposed to holding itself out of a LED lighting fixture due to the accumulation of heat inside the fixture. The typical interior LED lamp may have a typical design life of 35,000 to 60,000 hours.
9. An OLED OLED is an organic light emitting diode. This is an LED that also contains carbon. OLEDs are typically made of flexible sheets and lightweight. Today, OLEDs operate with significantly lower efficiency than inorganic (crystalline) LEDs. OLEDs typically generate less light per unit area than inorganic LEDs in solid state, which are generally designed to be used as point sources of light.
10. Infrared and UV LEDs do not emit infrared, or heat, radiation, like a light bulb. In addition, white LEDs do not create ultraviolet (UV) as a fluorescent bulb.
Although there were a lot of media attention to LED, there is still much too obvious that are not well designed. In short, the LED lighting market is still growing. Research continues to improve the brightness LEDs, efficiency and lifetime of LEDs rated at a remarkable pace. However, in the short term, be careful when you select an LED lighting fixture.
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