LED bulbs are the future of lighting. Be it automobiles, industries, household or any hobbyist requirement, LEDs form the best solutions in terms of long-term cost savings and power efficiency. Not only are these devices more efficient than traditional lighting devices, they are built to outlast any of their lighting predecessor. The internals of a typical LED bulb will be explored here.Externally, a LED bulb might look similar to a conventional incandescent lamp, but the two are quite different. The chassis of the bulb is made of ceramic and houses the electronic ballast. Ceramic is used for its insulating and heat dissipative properties.
An electric bulb is one of the revolutionary inventions ever made in the history of mankind. The working of an electric bulb is quite simple. When electric current flows through the filament made up of tungsten, it heats up emitting visible light.The entire assembly of the electric bulb is housed in an envelope of glass. The shape of the glass is responsible for giving directionality to the light. The outer glass is attached to the lower casing with the help of a stick material. The environment inside the glass is made inert by filling with a gas like argon. This prevents oxidation of filament at such high temperatures.
LED (Light Emitting Diode) is a special diode that emits light when an electric voltage is applied to it. It is common electronic component that is being used in devices like TV, computer, etc. generally for indicating purpose. They are available in various colors like red, yellow, green etc. There are two leads of an LED that are used to supply input voltage. The longer lead is positive and known as ‘Post’, and the smaller is negative known as ‘Anvil’ as shown in the image above. A metal cup is placed on the negative lead (Anvil) which holds a semiconductor die. The semiconductor die is a combination of two semiconductor materials – N type and P type and an active region (known as P-N junction) between them.