Types of LED

Types of LED

There various types of LED which are made of semiconductors and are classified into different categories. It is used due to its effectiveness in terms of lower power consumption, longer service life, better illumination.

Classification of LED based on sizes:

  • Miniature
    1. Low-current
    2. Standard
    3. Ultra-high output

Classification of LED based on power delivered:

  • High-Power

Classification of LED based on their application:

  • Flash
  • Bi and Tri-Colour
  • RGB LEDs
  • Alphanumeric
  • Lighting LEDs

Miniature LEDs

These are mostly used now these days. These are available in single shape and colour and are available in small sizes. It can be directly placed into a circuit board without the use of heating or cooling device. These are classified into low-current, standard and ultra-high output depending upon various factors such as voltage, total watts, current, and manufacturer type. These kind of LEDs are used in small appliances such as remote controls, calculators and cell phones.

High-Power LEDs

These uses of LED results in high output compared to normal LEDs. The light emitted is measured in terms of lumens. These are again categorised based on luminous intensity, wavelength and voltage. These has a danger of overheating hence a heat absorbing material is used to cool it down. These LEDs are used in high-powered lamps, automobile headlights, in various industrial and mechanical equipments.

Flash LED

With a normal LED, it contains an integrated circuit which flashes the light at a particular frequency. These are directly connected to a power supply without the help of series resistors. It is used in signboards, vehicles etc.

Bi and Tri-Colour

Bi-colour LED lights consists of two light emitting dies in a single case. The wiring is inversely parallel which means one is in forward direction and another in backward which makes one die lit at one time. Flow of current alternates between two dies which results in colour variation.

Tri-Colour LED lights design lets the two dies to lit separately or together producing a third colour.

Red Green Blue LEDs

These emits red, green and blue light and also allows to combine these three primary colours and produce a new colour. These are used in accent lighting, lights shows and status indicators.

Alphanumeric LED

These consists of segments which offer greater flexibility and lesser power consumption. In it, it has various types of LEDs such as:

14 and 16 segment- they cover full 26 character of roman alphabet in uppercase and with numerals 0-9

7 segment- covers all numbers and limited set of letters

Matrix segment- covers full alphabets (upper and lower), all number and full variety of symbols.

Lighting LED

These LEDs use aluminium/ceramic body which provides heat dissipation. One example is Edison light bulb design.

These were some types of LED, if you wish to know more, download BYJU’S The Learning App

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In Wheatstone's bridge P=9ohm, Q=11ohm, R=4ohm and S=6ohm. How much resistance must be put in parallel to the resistance S to balance the bridge