The Anatomy of a LED Light Bulb

Commercial, Tech

As we all know, LED stands for light emitting diode – A solid-state lighting (SSL) device. It’s called solid-state lighting because unlike incandescent and fluorescent lighting technologies, there are no gases involved in LEDs. Instead, energy is passed through a semiconductor (usually a solid chemical element or compound that can conduct electricity), lighting up the LED light bulb. A LED light is formed when bringing P-Type (+) and N-Type (-) semiconductors together that form a PN Junction.

Read below to learn about the parts that make up the Anatomy of a LED:


1. Lens/Optics

Due to the brightness of LEDs, a lens (or optics when used on omni-directional lamps) is used to evenly distribute the light. This helps the LED have the look and feel of traditional light bulbs. This piece is also usually made of plastic to reduce the risk of shattering.

2. LED Chips

LED chips are the components that create the light. They are small yellow LED pieces attached to a piece of metal, referred to as the PCB (printed circuit board). There are two main types of chip configurations TCP uses:

  • Chip on Board (COB): is a single LED chip on PCB, creating a clean, uniform beam pattern
  • Discrete: multiple LED chips placed on PCB

3. Heat Sink

The heat sink is the piece of metal the LED chips sit on. Heat needs to be conducted away from the LED and then cooled somehow – this is where the heat sink comes in. They provide the path for heat to travel from the LED light source to outside elements.

4. Circuit Board/Driver

The circuit board, also referred to as the driver, takes energy from the socket and tells the LEDs to turn on and off, dim and sometimes even change color. LED drivers are similar to ballasts in fluorescent lamps. LED drivers also protect LEDs from voltage or current fluctuations. A change in voltage could cause a change in the current being supplied to the LEDs.

LEDs are designed to run on low voltage (12-24V), but many can run on higher voltages (120-277V).

5. Housing

The circuit board heats up when energy passes through it, making it necessary for heat-conductive housing. This housing component is usually made with aluminum. The housing will still be warm to the touch, but not as hot as halogen, incandescent or fluorescent lighting.

6. Base

LEDs are designed as a direct replacement for existing light bulbs. They can also be found with any base that traditional bulbs are available in. There are many types of lamp bases:

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