What are LEDs? 

LED stand for Light Emitting Diode; they are a special type of light-emitting device which is visibly illuminated when electrical current passes through it. The visible LEDs are available in different ranges of brightness, depending on the strength of power emitted from the diodes. 

Types of LED 

LEDs can be of different types, the most common ones among which include:

• Flashing LEDs: These are warning indicators designed to flash at certain intervals.  
• Bi-colour LEDs: These types of LEDs feature two LED emitters of different colours so that each colour can depict a specific status, such as on and off.
• Tri-colour LEDs: Like bicolour LEDs, tri-colour LEDs are single units of light-emitting diodes but feature three different colours instead of two. The most common example of a tri-colour LED is a traffic light. 
• RGB (or Red, Green, Blue) LEDs: These types of emitters are capable of generating combinations of the three primary colours. They are most usually seen in decorative applications.

Applications

LEDs are used almost everywhere, from industrial equipment to domestic appliances. The applications encompass a wide variety of industries as well. The most common applications of LEDs are:

• Indicator lights 
• Backlit displays
• Billboards 
• Smart devices
• Digital watch
• Calculators
• Mobile phones
• Laptops
• Instrument panels
• Medical devices