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LED Technology

LED is an electric component that emits light when connected to direct current. It emits light in visible light as well as infrared and ultraviolet. With low energy consumption, small size, longer lifetime and faster switching than incandescence lamps and because of that, they have a wide range of applicability.

Basic knowledge

The light-emitting diode (LED), a semiconductor diode which can emits light when voltage is applied to it, used in electronic devices, and it is one of the most energy-efficient and rapidly-developing lighting technologies, has the potential to mainly change the future of lighting in all over the world.

The wide range of  application of the light emitting diode (LED) which can offer, from your cell phone to the large billboards is increasing rapidly according to the distinguished aspects and specifications that it has, while they are very tiny in shape and consume very little power


Advantages of LED technology

LEDs easily offer lots of utilities over other lighting sources. Consumers, specialists and professional users can get multiple options and choices that are based on colors, dimensions and the flexibility that LED modules give, also LED lights offer high level of reliability even in the most difficult conditions

  • Operate On Very Low Voltage
  • High energy efficiency level
  • Long lifetime
  • Less cost than traditional lighting for long use.
  • Small possible dimensions.
  • Immediate light at switching on.
  • Wide range of color temperature (CCT) values.
  • High color saturation level without filtering.
  • Wide range of operating temperatures.
  • Produce Zero UV Emissions.
  • LED Lights Are Environmentally Safe

The Difference between SMD and COB LED lights


SMD vs COB: What is SMD?

“SMD” surface mounted device, LED chip is integrated with a printed board. This type of LED is more popular due to its variety and multiple use, you can find it in almost every lighting type and even in your notification light on your cell phone. 

  • SMD comes in different sizes, there is 5050 SMD which comes in 5*5mm , and there is 3528 which is 3.5 width and 2.5 as length SMD LED has more than two contacts, and it can be up to 3 diodes on a single chip.
  • Each diode has its own circuit, and this is what gives the multi colors, including red, green and blue diode, with these three basic color. You can simply create any other color by adjusting the output level.
  • Chip is covered with phosphor powder which gives the yellow or orange color to the chip. The orange usually gives the warm white light color(2700-3500K), the yellow gives the white color (4000-6500K), and colorful RGB LED does not have phosphor on it.
  • SMD can produce high efficiency which can reach to 100 lumens per watt, which gives the bright color.

SMD vs COB: What is COB?

“COB” chip on board, comes with 2 contacts and 1 circuit, which makes not able to make multiple color changings like in the SMD.

  • The COB has PCB on its base substrate, this base can be ceramic or aluminum. Ceramic type has a better thermal conductive performance that can guarantee a lower LED working temperature.
  • COB is known for better efficiency (lumens per watt). Before heavy technology like flood lights made with LED were hard to get the high efficiency, because you would need multiple LED sources to produce that kind of high lumen output.
  • COB, now gives higher lumens with less energy. You can find it in different application like the flash of your cell phone.

LED life cycle

LEDs can easily pass 50,000 working hours, in comparing to other light sources, luminous flux can be just a little bit reduced over operation periods.


Factors have influence on LED life span:


1.Temperature

As much cooler is the device, as LED`s life span is longer, more effective and brighter, when releasing light, heat occurs which easily effects the life cycle and luminous flux of the LED, here comes the necessary need  of the heat sink and choosing the best installation way to divert heat.

2.Mechanical effect

If a LED is exposed to such forces, this can have a negative effect on its operating life, or even can be destroyed.

3.Power consumption

Whenever the current is lower, less energy is released and heat production is lower, which effects directly on the operation life

4.Housing

It is directly influenced by the light comes out from the chip itself. Like built-in reflector ages a lot in the first few hundred operating hours as a result of the high intensity and luminance of the light emitted by the chip.

5.Humidity

Bad material of the housing affect directly but in a passive way to the light comes out from the chip itself Humidity

6.Chemicals

chemical influences vary depending on the location, all environmental conditions must be taken into account

LED applications

There are plenty of LED applications that you can do it yourself and other needs a specialist`s assistance.

From LED spot light to LED strip lights and LED modules including indoor and outdoor applications

From urban lighting, for street and city lighting, façade lighting, landscape lighting,

Industrial, Offices and Residential lighting.


In this article : LED, COB, SMD, Semicnductor, Diode, أشباه الموصلات, أشباه النواقل, إنارة, Phosphor